U.S. Chairman of the Joint Chiefs of Staff General Mark Milley attends a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Defense Secretary Lloyd Austin attends a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Defense Secretary Lloyd Austin attends a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Defense Secretary Lloyd Austin attends a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Defense Secretary Lloyd Austin attends a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley and U.S. Defense Secretary Lloyd Austin attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley and U.S. Defense Secretary Lloyd Austin attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley and U.S. Defense Secretary Lloyd Austin attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley and U.S. Defense Secretary Lloyd Austin attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley, U.S. Defense Secretary Lloyd Austin and U.S. Assistant Secretary of Defense for International Security Affairs Celeste Wallander attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley, U.S. Defense Secretary Lloyd Austin and U.S. Assistant Secretary of Defense for International Security Affairs Celeste Wallander attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley and U.S. Defense Secretary Lloyd Austin attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Chairman of the Joint Chiefs of Staff General Mark Milley and U.S. Defense Secretary Lloyd Austin attend a virtual meeting of Ukraine Defense Contact Group, at the Pentagon in Washington, U.S. March 15, 2023. Andrew Caballero-Reynolds/Pool via REUTERS 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

Israeli Defence Minister Yoav Gallant attends a news conference with U.S. Secretary of Defense Lloyd Austin at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

Israeli Defence Minister Yoav Gallant attends a news conference with U.S. Secretary of Defense Lloyd Austin at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin attends a news conference with Israeli Defence Minister Yoav Gallant at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin and his Israeli counterpart, Defence Minister Yoav Gallant hold a news conference at Ben Gurion airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Secretary of Defense Lloyd Austin meets Israeli Defence Minister Yoav Gallant at a news conference at Ben Gurion Airport in Lod, Israel, March 9, 2023. REUTERS/Amir Cohen 

U.S. Defence Secretary Lloyd Austin shakes hands with Israeli Defence Minister Yoav Gallant upon his arrival at Ben Gurion Airport, Israel, March 9, 2023. REUTERS/Idrees Ali 

U.S. Defence Secretary Lloyd Austin is greeted by Israeli Defence Minister Yoav Gallant at Ben Gurion Airport, Israel, March 9, 2023. REUTERS/Idrees Ali 

U.S. Defense Secretary Lloyd Austin attends a joint news conference with President of the Kurdistan region in Iraq Nechirvan Barzani (not pictured), in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin and President of the Kurdistan region in Iraq Nechirvan Barzani attend a joint news conference, in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin attends a joint news conference with President of the Kurdistan region in Iraq Nechirvan Barzani (not pictured), in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin and President of the Kurdistan region in Iraq Nechirvan Barzani attend a joint news conference, in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin and President of the Kurdistan region in Iraq Nechirvan Barzani shake hands as they attend a joint news conference, in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

President of the Kurdistan region in Iraq Nechirvan Barzani attends a joint news conference with U.S. Defense Secretary Lloyd Austin (not pictured), in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin and President of the Kurdistan region in Iraq Nechirvan Barzani attend a joint news conference, in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin and President of the Kurdistan region in Iraq Nechirvan Barzani shake hands as they attend a joint news conference, in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin and President of the Kurdistan region in Iraq Nechirvan Barzani shake hands as they attend a joint news conference, in Erbil, Iraq March 7, 2023. REUTERS/Azad Lashkari 

U.S. Defense Secretary Lloyd Austin is greeted next to a plane by Major General Matthew McFarlane, during his unannounced trip to Baghdad, Iraq, March 7, 2023. REUTERS/Idrees Ali 

U.S. Defense Secretary Lloyd Austin is greeted next to a plane by Major General Matthew McFarlane, during his unannounced trip to Baghdad, Iraq, March 7, 2023. REUTERS/Idrees Ali 

U.S. Defense Secretary Lloyd Austin embraces Major General Matthew McFarlane, during his unannounced trip to Baghdad, Iraq, March 7, 2023. REUTERS/Idrees Ali 

U.S. Defense Secretary Lloyd Austin stands next to a plane, as he makes an unannounced trip to Baghdad, Iraq, March 7, 2023. REUTERS/Idrees Ali 

Retired Army Vietnam veteran Colonel Paris Davis and his daughter Regan Hopper unveil a plaque at his Medal of Honor Hall of Heroes Induction ceremony at the Pentagon in Washington, U.S., March 6, 2023.  REUTERS/Kevin Lamarque 

Retired Vietnam veteran Army Colonel Paris Davis looks up after a plaque unveiling at his Medal of Honor Hall of Heroes Induction ceremony at the Pentagon in Washington, U.S., March 6, 2023.  REUTERS/Kevin Lamarque 

Retired Vietnam veteran Army Colonel Paris Davis listens to remarks at his Medal of Honor Hall of Heroes Induction ceremony at the Pentagon in Washington, U.S., March 6, 2023.  REUTERS/Kevin Lamarque 

Retired Vietnam veteran Army Colonel Paris Davis looks down after a plaque unveiling at his Medal of Honor Hall of Heroes Induction ceremony at the Pentagon in Washington, U.S., March 6, 2023.  REUTERS/Kevin Lamarque 

Flanked by Secretary of the U.S. Army Christine Wormuth and his daughter Regan Hopper, retired Army Vietnam veteran Colonel Paris Davis is presented with a photo and citation during his Medal of Honor Hall of Heroes Induction ceremony at the Pentagon in Washington, U.S., March 6, 2023.  REUTERS/Kevin Lamarque 

Retired U.S. Army Colonel Paris Davis and his daughter Regan Hopper unveil a plaque at his Medal of Honor Hall of Heroes Induction ceremony at the Pentagon in Washington, U.S., March 6, 2023.  REUTERS/Kevin Lamarque 

U.S. Defense Secretary Lloyd Austin holds a meeting with NATO Secretary General Jens Stoltenberg in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis 

Cookies adorned with the U.S. and NATO flags can be seen on the table during a meeting between U.S. Defense Secretary Lloyd Austin and NATO Secretary General Jens Stoltenberg in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis 

NATO Secretary General Jens Stoltenberg takes part in a meeting with U.S. Defense Secretary Lloyd Austin in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis 

U.S. Defense Secretary Lloyd Austin holds a meeting with NATO Secretary General Jens Stoltenberg with U.S. Joint Chiefs Chair Army General Mark Milley and other staff in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis 

NATO Secretary General Jens Stoltenberg gives a statement ahead of taking part in a meeting with U.S. Defense Secretary Lloyd Austin in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis 

U.S. Defense Secretary Lloyd Austin holds a meeting with NATO Secretary General Jens Stoltenberg with U.S. Joint Chiefs Chair Army General Mark Milley and other staff in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis 

U.S. Defense Secretary Lloyd Austin and NATO Secretary General Jens Stoltenberg take part in a welcome ceremony before holding a meeting in the Pentagon in Washington, U.S., February 8, 2023. REUTERS/Leah Millis