A view of a uniform patch of a NATO soldier inside the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A view of the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A view of a uniform patch of a NATO soldier inside the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A view of the Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A soldier sits inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A soldier sits inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

Soldiers sit inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg gets off a Boeing AWACS reconnaissance plane during a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A soldier sits inside a Boeing AWACS reconnaissance plane during a ceremony over the signing of a contract between NATO and Boeing, on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg speaks at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur speak at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur attend a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur shake hands at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg and President of Boeing International Michael Arthur shake hands at a ceremony over signing a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg speaks at a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

President of Boeing International Michael Arthur speaks at a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

The door of a Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

The rotodome of a Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

A part of a Boeing AWACS reconnaissance plane is seen before a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

NATO Secretary General Jens Stoltenberg speaks at a ceremony over a contract between NATO and Boeing on upgrades to the alliance's fleet, at Melsbroek Air Base in Brussels, Belgium, November 27, 2019. REUTERS/Johanna Geron

Prime Minister Hubert MInnis boards a U.S. Coast Guard plane, en route to Abaco for a reconnaissance flight to survey damage caused by Hurricane Dorian, in Nassau, Bahamas, September 3, 2019. REUTERS/John Marc Nutt MANDATORY CREDIT.

A tail of the WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron bears the name "Hurricane Hunters" as the plane awaits its departure from Keesler Air Force Base in Biloxi, Mississippi to fly into the eye of Hurricane Irma off the coast of southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque

A tail of the WC-130J Super Hercules from the Air Force's 53rd Weather Reconnaissance Squadron bears the name "Hurricane Hunters" as the plane awaits its departure from Keesler Air Force Base in Biloxi, Mississippi to fly into the eye of Hurricane Irma off the coast of southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque

A U.S. Air Force Reserves officer from the 53rd Weather Reconnaissance Squadron know as the "Hurricane Hunters" shows the inner workings of a dropsonde, a device dropped from planes to monitor meteorological data in a hurricane, at Keesler Air Force Base in Biloxi, Mississippi, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque

U.S. Air Force reserve citizen airman Staff Sgt. Nicholas Monteleone speaks on the phone beside a painting of planes flying through a hurricane at Keesler Air Force Base, home of the 53rd Weather Reconnaissance Squadron know as "Hurricane Hunters" in Biloxi, Mississippi, hours before taking off in a WC-130J Super Hercules to fly into the eye of Hurricane Irma off southern Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque

U.S. Air Force Reserve Technical Sgt. Karen Moore (L) and Major Nicole Mitchell look at a dropsonde, a device dropped from planes to monitor meteorological data in a hurricane, aboard a WC-130J Super Hercules from the 53rd Weather Reconnaissance Squadron know as the "Hurricane Hunters" en route to the eye of Hurricane Irma as the storm nears the coast of Florida, U.S., September 8, 2017. Picture taken September 8, 2017. REUTERS/Kevin Lamarque

Indonesian airforce personnel tidy up their CN235-220 maritime surveillance aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 17, 2016. Picture taken February 17, 2016. REUTERS/Edgar Su

Indonesian airforce personnel stand next to their CN235-220 maritime surveillance aircraft displayed at the Singapore Airshow at Changi Exhibition Center February 17, 2016. Picture taken February 17, 2016. REUTERS/Edgar Su

Britain's Prime Minister David Cameron (6th L) speaks with military personnel as he stands between an RAF Sentinel surveillance aircraft (L) and an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

French National Front party deputy Marion Marechal-Le Pen arrives as French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY

French Prime Minister Manuel Valls (C) waits to deliver a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

French Prime Minister Manuel Valls leaves after delivering a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

French Prime Minister Manuel Valls delivers a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

French Prime Minister Manuel Valls leaves after delivering a speech to explain France's decision to launch reconnaissance flights over Syria, at the National Assembly in Paris, France, September 15, 2015. French Prime Minister Manuel Valls said on Tuesday any compromise or arrangement with the Syrian President to reach a political solution was impossible as far as his country was concerned. REUTERS/Philippe Wojazer

A tour group gathers under a Lockheed SR-71 Blackbird at the Udvar-Hazy Smithsonian National Air and Space Annex Museum in Chantilly, Virginia August 28, 2015. The SR-71 was a long-range spy plane that was in use from 1964 to 1998 and designed to operate at three times the speed of sound. REUTERS/Gary Cameron

A NATO AWACS (Airborne Warning and Control Systems) aircraft is seen on the tarmac as it prepares to take-off for a training mission from the AWACS air base in Geilenkirchen near the German-Dutch border April 16, 2014. NATO said on Wednesday it would send more ships, planes and troops to eastern Europe to reassure allies worried by Russia's annexation of Crimea but shied away from new permanent bases in the east as Poland wanted. REUTERS/Francois Lenoir (GERMANY - Tags: POLITICS MILITARY TRANSPORT TPX IMAGES OF THE DAY)

A Lithuanian military aircraft transporter stands on the tarmac during a joint NATO military exercise in Siauliai April 1, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. Picture taken April 1. REUTERS/Ints Kalnins (LITHUANIA)

Airmen board a NATO AWACS (Airborne Warning and Control Systems) aircraf during a joint NATO military exercise in Siauliai April 1, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. Picture taken April 1. REUTERS/Ints Kalnins (LITHUANIA)

NATO AWACS (Airborne Warning and Control Systems) aircrafts stand on the apron at the AWACS air base in Geilenkirchen near the German-Dutch border April 3, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY - Tags: MILITARY POLITICS TRANSPORT)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes-off for a flight to Poland from the AWACS air base in Geilenkirchen near the German-Dutch border April 2, 2014. The NATO alliance said it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. NATO foreign ministers meeting in Brussels this week suspended all practical cooperation with Russia in protest at its actions in Crimea and asked military commanders to draw up plans to reinforce NATO members in eastern Europe that are fearful about a threat from Russia. REUTERS/Ina Fassbender (GERMANY)

A NATO AWACS (Airborne Warning and Control Systems) aircraft takes off for a routine training flight from the AWACS air base in Geilenkirchen near the German-Dutch border March 12, 2014. The NATO alliance said on Monday it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. REUTERS/Wolfgang Rattay (GERMANY - Tags: MILITARY CONFLICT TRANSPORT TPX IMAGES OF THE DAY)

The patch of the NATO AWACS (Airborne Warning and Control Systems) aircraft is seen attached to the uniform of a soldier at the AWACS air base in Geilenkirchen near the German-Dutch border March 11, 2014. The NATO alliance said on Monday it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea.REUTERS/Wolfgang Rattay (GERMANY - Tags: MILITARY CONFLICT TRANSPORT)

The patch of the NATO AWACS (Airborne Warning and Control Systems) aircraft is seen attached to the uniform of a soldier at the AWACS air base in Geilenkirchen near the German-Dutch border March 11, 2014. The NATO alliance said on Monday it will start reconnaissance flights with AWACS planes from their home base in Geilenkirchen and Waddington in Britain over Poland and Romania to monitor the situation in neighbouring Ukraine where Russian forces have taken control of Crimea. REUTERS/Wolfgang Rattay (GERMANY - Tags: MILITARY CONFLICT TRANSPORT)

German Defence Minister Thomas De Maiziere holds a news conference at the defence ministry in Berlin June 5, 2013. Germany will stick to its commitment to help fund NATO drones, despite cancelling a plan to buy its own unmanned reconnaissance planes, its defence minister signalled on Tuesday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEADSHOT)

German Defence Minister Thomas De Maiziere holds a news conference at the defence ministry in Berlin June 5, 2013. Germany will stick to its commitment to help fund NATO drones, despite cancelling a plan to buy its own unmanned reconnaissance planes, its defence minister signalled on Tuesday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEADSHOT)

German Defence Minister Thomas De Maiziere holds a news conference at the defence ministry in Berlin June 5, 2013. Germany will stick to its commitment to help fund NATO drones, despite cancelling a plan to buy its own unmanned reconnaissance planes, its defence minister signalled on Tuesday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEADSHOT)

German Defence Minister Thomas De Maiziere gives a news conference at the defence ministry in Berlin June 5, 2013. Germany will stick to its commitment to help fund NATO drones, despite cancelling a plan to buy its own unmanned reconnaissance planes, its defence minister signalled on Tuesday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEADSHOT)