Bida Smajlovic, walks past the Memorial plaque of Srebrenica massacre before watching the Trial in Hague Tribunal, in Potocari near Srebrenica, Bosnia and Herzegovina March 24, 2016. Bida lost husband and brother and dozens members of family. REUTERS/Dado Ruvic 

Serbian Prime Minister Aleksandar Vucic addresses delegates the donors Conference for Syria in London, Britain February 4, 2016. REUTERS/Ben Stansall/Pool 

Serbian Prime Minister Aleksandar Vucic addresses delegates the donors Conference for Syria in London, Britain February 4, 2016. REUTERS/Ben Stansall/Pool 

A girl prays among a group of migrants heading towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A girl holds an umbrella as she walks in front of a group of migrants heading towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

Two migrants walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A migrant family walks in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A child eats on a migrant's shoulders as they walk towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic 

A migrant and a child hold hands as they walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

Migrants walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

Migrants carry their belongings as they walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

Migrants walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A migrant family walks in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic TPX IMAGES OF THE DAY 

A migrant woman pushes her children's pram as they walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A migrant pushes a child's pram as they walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A migrant and a child hold hands as they walk in the rain towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

Two migrants use a blanket to protect themselves from the rain as they walk towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

Two migrants carry a child in a pram as they walk towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic TPX IMAGES OF THE DAY 

Two children protect themselves from the rain as they walk among a group of migrants towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A child walks in front of a group of migrants heading towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

A child walks in front of a group of migrants heading towards the Hungarian border from Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic

An injured migrant pauses as he walks towards the Hungarian border after arriving at the train station in Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic TPX IMAGES OF THE DAY 

A migrant protects himself from the rain as he walks towards the Hungarian border after arriving at the train station in Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic TPX IMAGES OF THE DAY 

A girl eats as she walks among migrants towards the Hungarian border after arriving at the train station in Botovo, Croatia September 24, 2015. A trade war erupted between Serbia and Croatia on Thursday over the flow of migrants across their border, dragging relations between the ex-Yugoslav republics to their lowest ebb since the overthrow of late Serbian strongman Slobodan Milosevic in 2000. REUTERS/Antonio Bronic 

Migrants play soccer on a field near the train station in Tovarnik, Croatia September 19, 2015. Hungary and Croatia traded threats on Saturday as thousands of exhausted migrants poured over their borders, deepening the disarray in Europe over how to handle the tide of humanity. More than 20,000 migrants, many of them refugees from the Syrian war, have trekked into Croatia since Tuesday, when Hungary used a metal fence, tear gas and water cannon on its southern border with Serbia to bar their route into the European Union. REUTERS/Stoyan Nenov 

Migrants wait to board a train at the train station in Tovarnik, Croatia September 19, 2015. Hungary and Croatia traded threats on Saturday as thousands of exhausted migrants poured over their borders, deepening the disarray in Europe over how to handle the tide of humanity. More than 20,000 migrants, many of them refugees from the Syrian war, have trekked into Croatia since Tuesday, when Hungary used a metal fence, tear gas and water cannon on its southern border with Serbia to bar their route into the European Union. REUTERS/Stoyan Nenov 

Abeer (R), 26, a Syrian migrant from Deir Al Zour in war-torn Syria, stands at a railway station near the Serbian crossing border in Macedonia September 13, 2015. Picture taken September 13, 2015. REUTERS/Zohra Bensemra 

Serbian soldiers march during the military parade marking the 70th anniversary of the end of World War Two, in Beijing, China, September 3, 2015. REUTERS/Damir Sagolj 

Chinese President Xi Jinxing (3rd L) meets with Serbian President Tomislav Nikolic (not pictured) at the Great Hall of the People in Beijing, China August 31, 2015. Nikolic will attend the parade marking the 70th anniversary of the end of World War Two on September 3. REUTERS/Lintao Zhang/Pool 

Serbian President Tomislav Nikolic (3rd R) meets with Chinese President Xi Jinping (not pictured) at the Great Hall of the People in Beijing, China August 31, 2015. Nikolic will attend the parade marking the 70th anniversary of the end of World War Two on September 3. REUTERS/Lintao Zhang/Pool 

Chinese President Xi Jinping meets with Serbian President Tomislav Nikolic at the Great Hall of the People in Beijing, China August 31, 2015. Nikolic will attend the parade marking the 70th anniversary of the end of World War Two on September 3. REUTERS/Lintao Zhang/Pool 

Chinese President Xi Jinping (L) meets with Serbian President Tomislav Nikolic (2nd R) at the Great Hall of the People in Beijing, China August 31, 2015. Nikolic will attend the parade marking the 70th anniversary of the end of World War Two on September 3. REUTERS/Lintao Zhang/Pool 

Chinese President Xi Jinping (R) shakes hands with Serbian President Tomislav Nikolic at the Great Hall of the People in Beijing, China August 31, 2015. Nikolic will attend the parade marking the 70th anniversary of the end of World War Two on September 3. REUTERS/Lintao Zhang/Pool 

Chinese President Xi Jinping (R) shakes hands with Serbian President Tomislav Nikolic at the Great Hall of the People in Beijing, China August 31, 2015. Nikolic will attend the parade marking the 70th anniversary of the end of World War Two on September 3. REUTERS/Lintao Zhang/Pool 

Sevar Ali (L), a migrant from Kurdistan region in northern Iraq, shaves next to his wife Vian Xhoshe, near a camp in the town of Presevo, Serbia, August 26, 2015. Hungary made plans on Wednesday to reinforce its southern border with helicopters, mounted police and dogs, and was also considering using the army to confront a record number of migrants trekking into Europe, many fleeing war in Syria. Police said a record 2,533 migrants - most of them from Syria, Afghanistan and Pakistan - were caught entering Hungary from Serbia on Tuesday. REUTERS/Agron Beqiri 

Migrant and refugees wait for a registration procedure in the town of Presevo, Serbia, August 26, 2015. Hungary made plans on Wednesday to reinforce its southern border with helicopters, mounted police and dogs, and was also considering using the army to confront a record number of migrants trekking into Europe, many fleeing war in Syria. Police said a record 2,533 migrants - most of them from Syria, Afghanistan and Pakistan - were caught entering Hungary from Serbia on Tuesday. REUTERS/Agron Beqiri 

Migrants and refugees wait in line to enter a camp in the town of Presevo, Serbia, August 26, 2015. Hungary made plans on Wednesday to reinforce its southern border with helicopters, mounted police and dogs, and was also considering using the army to confront a record number of migrants trekking into Europe, many fleeing war in Syria. Police said a record 2,533 migrants - most of them from Syria, Afghanistan and Pakistan - were caught entering Hungary from Serbia on Tuesday. REUTERS/Agron Beqiri 

Migrants sleep in sleeping bags in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

A migrant familly sleeps in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

Migrants sleep in tents in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

Migrants sleep on a bench in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

Migrants sleep in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

A migrant familly sleeps in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

A migrant with a child sits in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

Migrants sleep in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

A migrant family sleeps in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

A migrant with a child sleeps in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

Migrants sleep in a park near the main bus and train station in Belgrade, Serbia, August 26, 2015. A surge in migrants, many of them refugees from Syria, hit Hungary's southern border on Tuesday, passing through gaps in an unfinished barrier to a Europe groping for answers to its worst refugee crisis since World War Two. REUTERS/Marko Djurica

A migrant carries a child as they walk along a road near the village of Miratovac near the town of Presevo, Serbia, August 25, 2015. The Balkans is in the grips of an unprecedented surge in migration fuelled by war in Syria and instability across the Middle East. REUTERS/Agron Beqiri

Hungarian police check Syrian immigrants after they crossed the Hungarian-Serbian border near Roszke, Hungary August 25, 2015. Hungary is racing to seal its border with Serbia by building a 4-metre high, 175-km barrier to keep out migrants streaming through the Balkans, fleeing war, poverty and upheaval in the Middle East and Africa for a better life in western Europe. REUTERS/Laszlo Balogh 

Syrian migrants rest on a street after crossing the Hungarian-Serbian border near Roszke, Hungary August 25, 2015. Hungary is racing to seal its border with Serbia by building a 4-metre high, 175-km barrier to keep out migrants streaming through the Balkans, fleeing war, poverty and upheaval in the Middle East and Africa for a better life in western Europe. REUTERS/Laszlo Balogh 

Serbian riot police stand guard in front of the Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

Serbian nationalists shout slogans in front of the Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

Serbian nationalists shout slogans in front of the Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

Serbian nationalist leader Vojislav Seselj (C behind the flag) and his party members burn Croatian national flag in front of Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

Serbian nationalist leader Vojislav Seselj (3rd R) and his party members burn the Croatian national flag in front of the Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

Serbian nationalist leader Vojislav Seselj (C) and his party members burn the Croatian national flag in front of the Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

Serbian nationalist leader Vojislav Seselj (not seen) and his party members burn the Croatian national flag in front of Croatian embassy during a protest marking the 20th anniversary of Croatia's four-day Operation Storm, in Belgrade, Serbia August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary on Wednesday of the blitz that ended its independence war while Serbia mourned the event as 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

A woman crosses herself during a memorial to mark the 20th anniversary of Croatia's four-day Operation Storm, in front of the St. Marko church in Belgrade, Serbia, August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary of a military blitz that ended its independence war while Serbia mourned the event it calls 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica 

A man flashes a traditional Serbian Orthodox three-finger sign during a memorial to mark the 20th anniversary of Croatia's four-day Operation Storm, in front of the parliament building in Belgrade, Serbia, August 5, 2015. Croatia rolled out tanks and waved flags to mark the 20th anniversary of a military blitz that ended its independence war while Serbia mourned the event it calls 'the biggest ethnic cleansing since World War Two'. REUTERS/Marko Djurica