European Council President Charles Michel and European Commission President Ursula von der Leyen walk with leaders of the Western Balkans; Montenegro's President Milo Dukanovic, Croatian Prime Minister Andrej Plenkovic, Kosovo President Hashim Thaci, North Macedonia's Foreign Minister Nikola Dimitrov, Chairman of Bosnia and Herzogovina Zeljko Komsic, Serbian President Aleksandar Vucic and Albanian Prime Minister Edi Rama, prior to a group photo at an EU-Western Balkans meeting at the Europa building in Brussels, Belgium February 16, 2020. Virginia Mayo /Pool via REUTERS 

European Council President Charles Michel and European Commission President Ursula von der Leyen walk with leaders of the Western Balkans; Croatian Prime Minister Andrej Plenkovic, Chairman of Bosnia and Herzogovina Zeljko Komsic, Albanian Prime Minister Edi Rama, European Union's foreign policy chief Josep Borrell, North Macedonia's Foreign Minister Nikola Dimitrov, Kosovo President Hashim Thaci, Serbian President Aleksandar Vucicj and Montenegro's President Milo Dukanovic, prior to a group photo at an EU-Western Balkans meeting at the Europa building in Brussels, Belgium February 16, 2020. Virginia Mayo /Pool via REUTERS 

European Council President Charles Michel speaks as he directs leaders of the Western Balkans; Montenegro's President Milo Dukanovic, European Union's foreign policy chief Josep Borrell, Croatian Prime Minister Andrej Plenkovic, Kosovo President Hashim Thaci, North Macedonia's Foreign Minister Nikola Dimitrov, Chairman of Bosnia and Herzogovina Zeljko Komsic, Serbian President Aleksandar Vucic, Albanian Prime Minister Edi Rama and European Commission President Ursula von der Leyen onto the podium for a group photo at an EU-Western Balkans meeting at the Europa building in Brussels, Belgium February 16, 2020. Virginia Mayo /Pool via REUTERS 

Chairman of the Bosnian Tripartite presidency Dragan Covic (C) and members Bakir Izetbegovic (2ndL) and Mladen Ivanic (2ndR) attend a news conference with Croatian President Kolinda Grabar Kitarovic (L) and Serbian President Aleksandar Vucic (R) after a meeting to discuss long-standing issues between the three countries in Mostar, Bosnia and Herzegovina, March 6, 2018. REUTERS/Dado Ruvic 

Chairman of the Bosnian Tripartite presidency Dragan Covic (C) and members Bakir Izetbegovic (L) and Mladen Ivanic (R) pose for photo with Croatian President Kolinda Grabar Kitarovic (2nd L) and Serbian President Aleksandar Vucic (2nd R) during a news conference after meeting to discuss long-standing issues between the three countries in Mostar, Bosnia and Herzegovina, March 6, 2018. REUTERS/Dado Ruvic 

Chairman of the Bosnian Tripartite presidency Dragan Covic and member Bakir Izetbegovic pose for photos with Croatian President Kolinda Grabar Kitarovic (2nd L) and Serbian President Aleksandar Vucic (R) during their meeting to discuss long-standing issues between the three countries in Mostar, Bosnia and Herzegovina, March 6, 2018. REUTERS/Dado Ruvic 

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Muslim women cry near coffins of their relatives, who are newly identified victims of the 1995 Srebrenica massacre, which are lined up for a joint burial in Potocari near Srebrenica, Bosnia and Herzegovina July 9, 2016. REUTERS/Dado Ruvic TPX IMAGES OF THE DAY

Ballet shoes are seen at the Bosnian War Childhood museum exhibition in Zenica, Bosnia and Herzegovina, June 21, 2016. "My childhood dream of becoming a prima ballerina never came true, but my love for ballet lived on, as did these pointe shoes," said Mela who was born in 1984. REUTERS/Dado Ruvic SEARCH "CHILDHOOD TOYS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Senior Forensic Anthropologist Dragana Vucetic of the International Commission on Missing Persons (ICMP) works to attempt to identify the remains of a victim of the Srebrenica massacre, at the ICMP centre near Tuzla, Bosnia and Herzegovina July 6, 2016. Picture taken July 6, 2016. REUTERS/Dado Ruvic 

Senior Forensic Anthropologist Dragana Vucetic of the International Commission on Missing Persons (ICMP) works to attempt to identify the remains of a victim of the Srebrenica massacre, at the ICMP centre near Tuzla, Bosnia and Herzegovina July 6, 2016. Picture taken July 6, 2016. REUTERS/Dado Ruvic 

Senior Forensic Anthropologist Dragana Vucetic of the International Commission on Missing Persons (ICMP) works to attempt to identify the remains of a victim of the Srebrenica massacre, at the ICMP centre near Tuzla, Bosnia and Herzegovina July 6, 2016. Picture taken July 6, 2016. REUTERS/Dado Ruvic 

A worker digs graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic 

Workers dig graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic 

A worker digs graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic 

Workers dig graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic 

Workers dig graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic 

Workers dig graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic 

Workers dig graves at a memorial centre for Srebrenica Massacre victims in Potocari, Bosnia and Herzegovina, July 7, 2016. REUTERS/Dado Ruvic TPX IMAGES OF THE DAY

Sajma Smajlovic (L) and Vasva Smajlovic watch on television the genocide trial of former Bosnian Serb leader Radovan Karadzic over the 1995 Srebrenica massacre as he appears before the U.N. tribunal in The Hague, as they gather at Smajlovic's house in Potocari near Srebrenica, March 24, 2016. REUTERS/Dado Ruvic 

Sajma Smajlovic (L) and Vasva Smajlovic watch on television the genocide trial of former Bosnian Serb leader Radovan Karadzic over the 1995 Srebrenica massacre as he appears before the U.N. tribunal in The Hague, as they gather at Smajlovic's house in Potocari near Srebrenica, March 24, 2016. REUTERS/Dado Ruvic 

Vasva Smajlovic cries as she watches on television the genocide trial of former Bosnian Serb leader Radovan Karadzic over the 1995 Srebrenica massacre as he appears before the U.N. tribunal in The Hague, as they gather at Smajlovic's house in Potocari near Srebrenica March 24, 2016. REUTERS/Dado Ruvic 

Sajma Smajlovic (R) and Vasva Smajlovic watch on television the genocide trial of former Bosnian Serb leader Radovan Karadzic over the 1995 Srebrenica massacre as he appears before the U.N. tribunal in The Hague, as they gather at Smajlovic's house in Potocari near Srebrenica March 24, 2016. REUTERS/Dado Ruvic 

Bida Smajlovic (R) and Sajma Smajlovic watch on television the genocide trial of former Bosnian Serb leader Radovan Karadzic over the 1995 Srebrenica massacre as he appears before the U.N. tribunal in The Hague, as they gather at Smajlovic's house in Potocari near Srebrenica March 24, 2016. REUTERS/Dado Ruvic 

Bida Smajlovic (C), Sajma Smajlovic (L) and Vasva Smajlovic watch on television the genocide trial of former Bosnian Serb leader Radovan Karadzic over the 1995 Srebrenica massacre as he appears before the U.N. tribunal in The Hague, as they gather at Smajlovic's house in Potocari near Srebrenica March 24, 2016. REUTERS/Dado Ruvic 

Bida Smajlovic, searches for the names on the Memorial plaque with names of killed in Srebrenica massacre before watching the Trial in Hague Tribunal, in Potocari near Srebrenica, Bosnia and Herzegovina March 24, 2016. Bida lost her husband and brother, and dozens of members of family. REUTERS/Dado Ruvic 

Bida Smajlovic, prays near the Memorial plaque with names of killed in Srebrenica massacre before watching the Trial in Hague Tribunal, in Potocari near Srebrenica, Bosnia and Herzegovina March 24, 2016. Bida lost her husband and brother, and dozens members of family. REUTERS/Dado Ruvic TPX IMAGES OF THE DAY

Bida Smajlovic, prays at the Memorial center near the graves of her husband and brother before watching 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 

Bida Smajlovic, prays at the Memorial center near the graves of her husband and brother before watching 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 

Bida Smajlovic, walks past the Memorial plaque with the names of killed in 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 

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 

Croatian President Kolinda Grabar-Kitarovic, Serbian President Tomislav Nikolic and Slovenian President Borut Pahor (L-R) pose for a picture before Brdo-Brijuni Process Leaders' Meeting at Presidental office in Zagreb, Croatia, November 25, 2015. REUTERS/Antonio Bronic 

Serbian Prime Minister Aleksandar Vucic and Croatian counterpart Zoran Milanovic (R) attend a meeting over the Balkan refugee crisis with leaders from central and eastern Europe at the EU Commission headquarters in Brussels, Belgium, October 25, 2015. REUTERS/Francois Lenoir

A child sits on a wooden pallet holding its soft toy as migrants wait to cross the border with Croatia near the village of Berkasovo, Serbia, October 21, 2015. About 3,500 migrants spent the night camped out in freezing cold at the Berkasovo-Bapska border crossing between Serbia and Croatia after the Croatian government closed the gates to limit the number of people entering the country. REUTERS/Marko Djurica

Migrants were stopped by Croatian police before they cross the border from Serbia into Croatia, near the village of Berkasovo, Serbia, October 1, 2015. REUTERS/Dado Ruvic TPX IMAGES OF THE DAY

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 

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 

Migrants walk on a dirt road close to the Croatian border near the town of Sid, Serbia, September 19, 2015. After suddenly finding itself in the path of Europe's biggest tide of migrants for decades, Croatia said on Friday it could no longer offer them refuge and would wave them on, challenging the EU to find a policy to receive them.. REUTERS/Stoyan Nenov 

A migrant carries a child as she walks on a dirt road close to the Croatian border near the town of Sid, Serbia, September 18, 2015. After suddenly finding itself in the path of Europe's biggest tide of migrants for decades, Croatia said on Friday it could no longer offer them refuge and would wave them on, challenging the EU to find a policy to receive them. Reuters/Stoyan Nenov 

Migrants walk on a dirt road close to the Croatian border near the town of Sid, Serbia, September 19, 2015. After suddenly finding itself in the path of Europe's biggest tide of migrants for decades, Croatia said on Friday it could no longer offer them refuge and would wave them on, challenging the EU to find a policy to receive them.. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road close to the Croatian border near the town of Sid, Serbia, September 19, 2015. After suddenly finding itself in the path of Europe's biggest tide of migrants for decades, Croatia said on Friday it could no longer offer them refuge and would wave them on, challenging the EU to find a policy to receive them.. REUTERS/Stoyan Nenov 

A migrant carries a child as she walks on a dirt road close to the Croatian border near the town of Sid, Serbia, September 19, 2015. After suddenly finding itself in the path of Europe's biggest tide of migrants for decades, Croatia said on Friday it could no longer offer them refuge and would wave them on, challenging the EU to find a policy to receive them. Reuters/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

A migrant pours water to cool off as he walks on a dirt road near the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. Reuters/Stoyan Nenov

A migrant carries a child through a cornfield as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. Reuters/Stoyan Nenov

A migrant carries a child through a cornfield as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. Reuters/Stoyan Nenov TPX IMAGES OF THE DAY

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. Reuters/Stoyan Nenov

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. Migrants continued to stream through fields from Serbia into the European Union on Friday, undeterred by Croatia's closure of almost all road crossings after an influx of more than 11,000. REUTERS/Stoyan Nenov 

A migrant carries a child as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. As hundreds of thousands of people risk lives to cross Europe's frontiers seeking a haven of peace, Europeans themselves have turned on each other with a venom that has stirred memories of their own long conflicts. REUTERS/Stoyan Nenov 

Migrants walk on a dirt road as they approach the Croatian border near the town of Sid, Serbia, September 18, 2015. As hundreds of thousands of people risk lives to cross Europe's frontiers seeking a haven of peace, Europeans themselves have turned on each other with a venom that has stirred memories of their own long conflicts. REUTERS/Stoyan Nenov