Britain's Prime Minister Boris Johnson meets Montenegrin Prime Minister Zdravko Krivokapic outside Downing Street, in London, Britain, July 7, 2021. REUTERS/Henry Nicholls

Britain's Prime Minister Boris Johnson meets Montenegrin Prime Minister Zdravko Krivokapic outside Downing Street, in London, Britain, July 7, 2021. REUTERS/Henry Nicholls

Britain's Prime Minister Boris Johnson meets Montenegrin Prime Minister Zdravko Krivokapic outside Downing Street, in London, Britain, July 7, 2021. REUTERS/Henry Nicholls

An aid adjusts the tie of Montenegrin Prime Minister Zdravko Krivokapic before an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic attends an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic attends an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic (R) watches as Montenegrin Economy Minister Jakov Milatovic (L) speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Economy Minister Jakov Milatovic speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic (R) watches as Montenegrin Economy Minister Jakov Milatovic (L) speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Economy Minister Jakov Milatovic speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Prime Minister Zdravko Krivokapic (R) watches as Montenegrin Economy Minister Jakov Milatovic (L) speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrin Economy Minister Jakov Milatovic speaks during an interview with Reuters in London, Britain, July 6, 2021. Picture taken July 6, 2021. REUTERS/Hannah McKay

Montenegrins wait for a coronavirus disease (COVID-19) vaccine at the start of a mass inoculation program in Podgorica, Montenegro, March 8, 2021. REUTERS/Stevo Vasiljevic

Montenegrins wait for a coronavirus disease (COVID-19) vaccine at the start of a mass inoculation program in Podgorica, Montenegro, March 8, 2021. REUTERS/Stevo Vasiljevic

Montenegrins older than 80 wait for a coronavirus disease (COVID-19) vaccine at the start of a mass inoculation program in Podgorica, Montenegro, March 8, 2021. REUTERS/Stevo Vasiljevic

Montenegrins older than 80 wait for a coronavirus disease (COVID-19) vaccine at the start of a mass inoculation program in Podgorica, Montenegro, March 8, 2021. REUTERS/Stevo Vasiljevic

Clergy of Montenegrin Orthodox Church hold service from the back of a truck during a ceremonial burning of dried oak branches "badnjak" in Cetinje, Montenegro January 6, 2021. Orthodox Christians celebrate Christmas according to the Julian calendar, which is 13 days behind the Gregorian version. REUTERS/Stevo Vasiljevic

A man wearing traditional Montenegrin hat makes the sign of the cross after placing dried oak branches "badnjak" on fire in Cetinje, Montenegro January 6, 2021. Orthodox Christians celebrate Christmas according to the Julian calendar, which is 13 days behind the Gregorian version. REUTERS/Stevo Vasiljevic

Protestors shout slogans during a rally ahead of a vote for the amendments of Law on Religious Freedoms, in front of parliament in Podgorica, Montenegro, December 28, 2020. Banner reads: "Montenegrin state, Montenegrin church, Montenegrin people". REUTERS/Stevo Vasiljevic

Members of Montenegrin nationalist groups shout slogans during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend, in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

Members of Montenegrin nationalist groups wave Montenegrian flags during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend, in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

Members of Montenegrin nationalist groups wave Montenegrian flags during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend, in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

Members of Montenegrin nationalist groups raise a banner saying "Never again 1918" during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend, in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

Members of Montenegrin nationalist groups wave Montenegrian flags during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend, in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

Members of Montenegrin nationalist groups wave Montenegrian flags during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend, in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

A member of a Montenegrin nationalist group waves a Montenegrian flag during a rally in front of Cetinje monastery as a reaction to celebrations of pro-Serb nationalists after parliamentary elections last weekend in Cetinje, Montenegro September 3, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, arrives to speak to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, arrives to speak to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, arrives to speak to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, is seen at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, leaves after he casted his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after he casted his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after he casted his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, speaks to the media after he casted his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, is seen at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, is seen at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, holds his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, holds his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, casts his ballot at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

Montenegrin President and leader of ruling Democratic Party of Socialists, Milo Djukanovic, is seen at a polling station during the general election in Podgorica, Montenegro August 30, 2020. REUTERS/Stevo Vasiljevic

A supporter of pro-Serbian parties carries a cross during a church-led rally ahead of Montenegrin Assembly election in Podgorica, Montenegro August 28, 2020. REUTERS/Goran Tomasevic

Supporters of pro-Serbian parties shout during a church-led rally ahead of Montenegrin Assembly election in Podgorica, Montenegro August 28, 2020. REUTERS/Goran Tomasevic

Supporters of pro-Serbian parties shout during a church-led rally ahead of Montenegrin Assembly election in Podgorica, Montenegro August 28, 2020. REUTERS/Goran Tomasevic

Supporters of pro-Serbian parties shout during a church-led rally ahead of Montenegrin Assembly election in Podgorica, Montenegro August 28, 2020. REUTERS/Goran Tomasevic

Supporters of pro-Serbian parties shout during a church-led rally ahead of Montenegrin Assembly election in Podgorica, Montenegro August 28, 2020. REUTERS/Goran Tomasevic

A man in a traditional Montenegrin costume waves a flag in front of a crowd during a church-led rally ahead of general election, in Podgorica, Montenegro, August 27, 2020. REUTERS/Stevo Vasiljevic

A supporter of pro-Serbian parties holds a Serbian flag and an icon in front of Serbian Orthodox Cathedral of the Resurrection of Christ, ahead of Montenegrin Assembly election in Podgorica, Montenegro August 27, 2020. REUTERS/Goran Tomasevic

A supporter of pro-Serbian parties stands in front of Serbian Orthodox Cathedral of the Resurrection of Christ, ahead of Montenegrin Assembly election in Podgorica, Montenegro August 27, 2020. REUTERS/Goran Tomasevic

A supporter of pro-Serbian parties holds a Serbian flag in front of Serbian Orthodox Cathedral of the Resurrection of Christ, ahead of Montenegrin Assembly election in Podgorica, Montenegro August 27, 2020. REUTERS/Goran Tomasevic

A woman walks near an anti-Montenegro President Milo Djukanovic poster ahead of Montenegrin Assembly election, in Podgorica, Montenegro August 27, 2020. REUTERS/Goran Tomasevic

A woman prays in Serbian Orthodox Cathedral of the Resurrection of Christ, ahead of Montenegrin Assembly election, in Podgorica, Montenegro August 26, 2020. REUTERS/Goran Tomasevic

Women, supporters of pro-Serbian parties, cover themselves with Serbian flag in front of Serbian Orthodox Cathedral of the Resurrection of Christ, ahead of Montenegrin Assembly election, in Podgorica, Montenegro August 26, 2020. REUTERS/Goran Tomasevic

Montenegrin Prime Minister Dusko Markovic is welcomed by European Council President Charles Michel ahead of a meeting at the European Council building in Brussels, Belgium July 13, 2020. Stephanie Lecocq/Pool via REUTERS