Bulgarian Navy minehunter BGS Tsibar sails in the Bosphorus towards the Black Sea, in Istanbul, Turkey October 29, 2020, after participating in the Turkish Navy-led multinational Mine Warfare Exercise Nusret-2020. REUTERS/Murad Sezer

Medical personnel from Sofia's biggest emergency hospital, Pirogov turn on the flashlights of their mobile phones, as they participate in an organised initiative by Sofia's major hospitals to appeal to Bulgarians to comply with the restrictions aimed at containing the spike in the spread of the coronavirus disease (COVID-19), Bulgaria, October 27, 2020. REUTERS/Stoyan Nenov

Medical personnel from Sofia's biggest emergency hospital, Pirogov turn on the flashlights of their mobile phones, as they participate in an organised initiative by Sofia's major hospitals to appeal to Bulgarians to comply with the restrictions aimed at containing the spike in the spread of the coronavirus disease (COVID-19), Bulgaria, October 27, 2020. REUTERS/Stoyan Nenov

Bulgarian Minister of Agriculture Desislava Taneva attends an EU agriculture and fisheries ministers meeting in Luxembourg October 19, 2020. Francois Walschaerts/Pool via REUTERS

A man wears a Bulgarian flag as he holds a banner that partially reads: "Wake up" during an anti-government demonstration in Sofia, Bulgaria October 3, 2020. REUTERS/Stoyan Nenov

A man waves a Bulgarian flag during an anti-government demonstration in Sofia, Bulgaria October 3, 2020. REUTERS/Stoyan Nenov

Dutch Prime Minister Mark Rutte speaks with Bulgarian Prime Minister Boyko Borissov at the start of the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Olivier Hoslet/Pool via REUTERS

Dutch Prime Minister Mark Rutte speaks with Bulgarian Prime Minister Boyko Borissov at the start of the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel bumps elbows with Bulgarian Prime Minister Boyko Borissov at the start of the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel reacts as European Commission President Ursula von der Leyen and Bulgarian Prime Minister Boyko Borissov greet at the start of the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Olivier Hoslet/Pool via REUTERS

European Council President Charles Michel reacts as European Commission President Ursula von der Leyen and Bulgarian Prime Minister Boyko Borissov greet at the start of the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Olivier Hoslet/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov takes off his face mask as he arrives for the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Francisco Seco/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov gestures as he arrives for the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Aris Oikonomou/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov arrives for the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Aris Oikonomou/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov arrives for the second face-to-face European Union summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium October 1, 2020. Aris Oikonomou/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov, Austria's Chancellor Sebastian Kurz and Romanian President Klaus Iohannis attend the second face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium, October 1, 2020. REUTERS/Johanna Geron/Pool

A general view shows the courtroom at the Specialised Criminal Court in Sofia, Bulgaria, September 21, 2020, before the start of the trial for the 2012 bus bombing that killed five Israeli tourists and a Bulgarian driver at a Black Sea airport. REUTERS/Stoyan Nenov

A general view shows the courtroom at the Specialised Criminal Court in Sofia, Bulgaria, September 21, 2020, before the start of the trial for the 2012 bus bombing that killed five Israeli tourists and a Bulgarian driver at a Black Sea airport. REUTERS/Stoyan Nenov

Protesters hold a large Bulgarian flag as they attend an anti-government demonstration in Sofia, Bulgaria September 10, 2020. REUTERS/Stoyan Nenov

A protester holds a large Bulgarian flag as he attends an anti-government demonstration in Sofia, Bulgaria September 10, 2020. REUTERS/Stoyan Nenov

A man wrapped in Bulgarian flag attends an anti-government demonstration in Sofia, Bulgaria, July 30, 2020. REUTERS/Stoyan Nenov

A protester throws an egg at the Bulgarian government building during an anti-government demonstration in Sofia, Bulgaria, July 30, 2020. REUTERS/Stoyan Nenov

A protester wearing a mask gestures next to the Bulgarian national flags, as he takes part in an anti-government demonstration in Sofia, Bulgaria July 29, 2020. REUTERS/Stoyan Nenov

A protester gestures next to the Bulgarian national flags, as he takes part in an anti-government demonstration in Sofia, Bulgaria July 29, 2020. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev waves after meeting protesters at an anti-government demonstration in Sofia, Bulgaria, July 23, 2020. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev waves after meeting protesters at an anti-government demonstration in Sofia, Bulgaria, July 23, 2020. REUTERS/Stoyan Nenov

A demonstrator waves a Bulgarian flag while standing on a windowsill during an anti-government protest, in Sofia, Bulgaria July 21, 2020. REUTERS/Stoyan Nenov

A demonstrator waves a Bulgarian flag during an anti-government protest, in Sofia, Bulgaria July 21, 2020. REUTERS/Stoyan Nenov

A general view shows the Bulgarian parliament after voting on a no-confidence motion against the government of Prime Minister Boyko Borissov in Sofia, Bulgaria, July 21, 2020. REUTERS/Stoyan Nenov

A general view shows the Bulgarian parliament during voting on a no-confidence motion against the government of Prime Minister Boyko Borissov in Sofia, Bulgaria, July 21, 2020. REUTERS/Stoyan Nenov

A general view shows the Bulgarian parliament after voting on a no-confidence motion against the government of Prime Minister Boyko Borissov in Sofia, Bulgaria, July 21, 2020. REUTERS/Stoyan Nenov

A man holds up a Bulgarian flag as people protest against the Bulgarian government on the sidelines of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 19, 2020. REUTERS/Francois Lenoir

A woman shows a photo of Bulgarian Prime Minister Boyko Borisov as people protest against his government on the sidelines of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 19, 2020. REUTERS/Francois Lenoir

People protest against the Bulgarian government on the sidelines of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 19, 2020. REUTERS/Francois Lenoir

People protest against the Bulgarian government on the sidelines of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 19, 2020. REUTERS/Francois Lenoir

Bulgarian Prime Minister Boyko Borissov and Dutch Prime Minister Mark Rutte react during the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 18, 2020. REUTERS/Francois Lenoir/Pool

Bulgarian Prime Minister Boyko Borissov gestures next to Germany's Chancellor Angela Merkel at the start of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 17, 2020. Stephanie Lecocq/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov gives a present to Germany's Chancellor Angela Merkel at the start of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 17, 2020. Stephanie Lecocq/Pool via REUTERS

Germany's Chancellor Angela Merkel (L) and Bulgarian Prime Minister Boyko Borisov (R) talk at the start of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 17, 2020. Stephanie Lecocq/Pool via REUTERS

Bulgarian Prime Minister Boyko Borissov and European Council President Charles Michel greet each other at the start of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 17, 2020. Stephanie Lecocq/Pool via REUTERS

Greece's Prime Minister Kyriakos Mitsotakis, Bulgarian Prime Minister Boyko Borissov and European Council President Charles Michel greet each other at the start of the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 17, 2020. Stephanie Lecocq/Pool via REUTERS

Greek Prime Minister Kyriakos Mitsotakis, Bulgarian Prime Minister Boyko Borissov and European Council President Charles Michel speak as they take part in the first face-to-face EU summit since the coronavirus disease (COVID-19) outbreak, in Brussels, Belgium July 17, 2020. REUTERS/Francois Lenoir/Pool

Danish Foreign Minister Jeppe Kofod, Spain's Foreign Minister Arancha Gonzalez, Bulgarian Minister of Foreign Affairs Ekaterina Zaharieva and Croatia's Foreign Minister Gordan Grlic-Radman attend a meeting of EU foreign ministers at the European Council building in Brussels, Belgium July 13, 2020. Stephanie Lecocq/Pool via REUTERS

Spain's Foreign Minister Arancha Gonzalez and Bulgarian Minister of Foreign Affairs Ekaterina Zaharieva attend a meeting of EU foreign ministers at the European Council building in Brussels, Belgium July 13, 2020. Stephanie Lecocq/Pool via REUTERS

Spain's Foreign Minister Arancha Gonzalez and Bulgarian Minister of Foreign Affairs Ekaterina Zaharieva attend a meeting of EU foreign ministers at the European Council building in Brussels, Belgium July 13, 2020. Stephanie Lecocq/Pool via REUTERS

German Foreign Minister Heiko Maas and Bulgarian Foreign Minister Ekaterina Zaharieva put on protective masks as they attend a meeting of EU foreign ministers at the European Council building in Brussels, Belgium July 13, 2020. Stephanie Lecocq/Pool via REUTERS

People take part in a demonstration after prosecutors raided Bulgarian president's offices as part of investigations, in Sofia, Bulgaria, July 9, 2020. REUTERS/Stoyan Nenov

A man shout slogans during a demonstration in front of the Court of Justice after prosecutors raided Bulgarian president's offices as part of investigations, in Sofia, Bulgaria, July 9, 2020. REUTERS/Stoyan Nenov

A man holds national flag during a demonstration in front of the government building after prosecutors raided Bulgarian president's offices as part of investigations, in Sofia, Bulgaria, July 9, 2020. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev (C) talks to supporters at a demonstration after prosecutors raided Bulgarian president's offices as part of investigations, in Sofia, Bulgaria, July 9, 2020. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev (C) talks to supporters at a demonstration after prosecutors raided Bulgarian president's offices as part of investigations, in Sofia, Bulgaria, July 9, 2020. REUTERS/Stoyan Nenov

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 Fans of Lokomotiv Plovdiv are seen after the match, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 Lokomotiv's Momchil Tsvetanov celebrates with the trophy with his teammates after winning the Bulgarian Cup, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 Lokomotiv players celebrate after the match, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 Lokomotiv's Momchil Tsvetanov celebrates after scoring his goal from the penalty spot, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 Lokomotiv's Dimitar Krasimirov Iliev celebrates with the trophy after winning the Bulgarian Cup, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 Lokomotiv's Dimitar Krasimirov Iliev celebrates with the trophy after winning the Bulgarian Cup, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

Soccer Football - Bulgarian Cup Final - CSKA Sofia v Lokomotiv Plovdiv - Vasil Levski National Stadium, Sofia, Bulgaria - July 1, 2020 CSKA Sofia players look dejected after the match, following the outbreak of the coronavirus disease (COVID-19) REUTERS/Stoyan Nenov