Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Anton Waldner, Major General of European Forces (EUFOR) speaks with media during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Participants of the European Union Force (EUFOR), Armed Forces, Border Police and State Investigation and Protection Agency (SIPA) of Bosnia and Herzegovina practice an anti-terrorism situation during an exercise at the Sarajevo International Airport, Bosnia and Herzegovina October 13, 2017. REUTERS/Dado Ruvic 

Turkish soliders attend a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Turkish soliders attend a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Anton Waldner (L-R), new Major General of European Forces (EUFOR), Adrian Bradshaw, General of European Forces , Mikhail Kostarakos, Chairman of the European Union Military Committee (CEUMC), James Rupert Everard, General of European Forces and Friedrich Schrotter, former Major General attends a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Anton Waldner (L-R), new Major General of European Forces (EUFOR), Adrian Bradshaw, General of European Forces, Mikhail Kostarakos, Chairman of the European Union Military Committee (CEUMC) and James Rupert Everard, General of European Forces attend a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

A member of European Forces (EUFOR) stands in front of the Bosnia and Herzegovina and European Union flags during Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Mikhail Kostarakos, Chairman of the European Union Military Committee (CEUMC), salutes during a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Anton Waldner, new Major General of European Forces (EUFOR), salutes during a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Anton Waldner, new Major General of European Forces (EUFOR), attends a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Anton Waldner, new Major General of European Forces (EUFOR), walks during a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

Anton Waldner, new Major General of European Forces (EUFOR), attends a EUFOR Change of Command Ceremony in Sarajevo, Bosnia and Herzegovina March 28, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) helicopters participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic 

EUFOR (European Union Force) army members participate in military exercise at Kalinovik training ground in Kalinovik, Bosnia and Herzegovina March 23, 2017. REUTERS/Dado Ruvic TPX IMAGES OF THE DAY 

Members of the local military take part in a parade during the handover ceremony from the European military operation in the Central African Republic (EUFOR RCA), who are ending their mission, in the capital Bangui March 13, 2015. REUTERS/Anthony Fouchard (CENTRAL AFRICAN REPUBLIC - Tags: CIVIL UNREST POLITICS CONFLICT MILITARY) 

General Philippe Ponties (L), commander of the European military operation in the Central African Republic (EUFOR RCA), presides over a handover ceremony as his forces prepare to end their mission, in the capital Bangui March 13, 2015. REUTERS/Anthony Fouchard (CENTRAL AFRICAN REPUBLIC - Tags: CIVIL UNREST POLITICS CONFLICT MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces march after a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces stand during a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces stand during a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces stand at attention during a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces stand at attention during a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces stand at attention during a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

Servicemen from the 23rd battalion of the II infantry brigade of the Georgian Armed Forces stand at attention during a farewell ceremony at the Vaziani military base outside Tbilisi December 9, 2014. According to Georgia's Defence Ministry, one company of the battalion departs to shift change another Georgian unit as a part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY) 

The tail of the world's largest aircraft An-225 is seen at Riga International Airport June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: MILITARY TRANSPORT POLITICS) 

The world's largest aircraft An-225 is parked on the tarmac at Riga International Airport June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: MILITARY TRANSPORT POLITICS) 

Specialists help to load equipment up onto the world's largest aircraft An-225 at Riga International Airport June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: POLITICS TRANSPORT) 

A man walks beside the world's largest aircraft An-225 at Riga International Airport June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: POLITICS TRANSPORT) 

Specialists talk near the world's largest aircraft An-225 in Riga June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: MILITARY TRANSPORT POLITICS) 

The world's largest aircraft An-225 lands at Riga International Airport June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: MILITARY TRANSPORT POLITICS) 

The world's largest aircraft An-225 is parked on the tarmac at Riga International Airport June 12, 2014. The An-225 aircraft arrived at Riga International Airport to pick up Latvia's military equipment as part of the EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/Ints Kalnins (LATVIA - Tags: POLITICS MILITARY TRANSPORT) 

Georgia's President Georgy Margvelashvili (L) talks to Defence Minister Irakly Alasania after a farewell ceremony for servicemen from the Batumi separate infantry battalion of Georgian Armed Forces at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Georgia's President Georgy Margvelashvili talks to servicemen from the Batumi separate infantry battalion of Georgian Armed Forces during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Georgia's President Georgy Margvelashvili addresses servicemen from the Batumi separate infantry battalion of Georgian Armed Forces during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Georgia's President Georgy Margvelashvili addresses servicemen from the Batumi separate infantry battalion of Georgian Armed Forces during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

An orthodox priest blesses servicemen from the Batumi separate infantry battalion of Georgian Armed Forces during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT RELIGION) 

Georgia's President Georgy Margvelashvili (L) talks to servicemen from the Batumi separate infantry battalion of Georgian Armed Forces during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT) 

Servicemen from the Batumi separate infantry battalion of Georgian Armed Forces stand at attention during a farewell ceremony at Vaziani military base outside Tbilisi, June 6, 2014. According to Gergia's Defence Ministry, one company of the battalion departs to join EUFOR-RCA European Union military operation in the Central African Republic. REUTERS/David Mdzinarishvili (GEORGIA - Tags: POLITICS MILITARY CONFLICT)