Aleksandar Vucic says that the suffering of Serbia has been tripled because of the double standards employed by "those whose part our country wants to become."

The Serbian president spoke late on Tuesday after his meeting with high-ranking representatives of Romania, Bulgaria and Greece in Varna, Bulgaria, and added that these three countries are "very important" and that they discussed "the injustice that has been inflicted on Serbia."

"As the president of Serbia, I felt the worst after the European Commission's report. I read it ten times to make sure there would be no confusion," Vucic said, referring to an EC statement about the cases of Kosovo and Catalonia "not being comparable."

"I saw the reaction of my colleagues, everyone talked about Serbia. Everybody feels that a great injustice has been done to Serbia. I have not heard that international law applies (differently) to members and non-members of the European Union," Vucic said after his meeting with Boyko Borisov, Alexis Tsipras and Mihai Tudose.

He added that the EU cannot talk about "a sui generis case" when it comes to Kosovo - and that "the letter (drafted on Monday) must be sent to Brussels." However, he added that he "does not expect that Brussels will react to the official letter from Serbia."

"'It (Kosovo) is a specific case' - so what does that mean? You cannot create a sui generis case," Vucic told Prva TV.

Vucic also spoke about Kosovo Prime Minister Ramush Haradinaj's statement that he would "give citizenship and passports to Albanians from the south of Serbia." The president remarked ironically, "those passports will get them far," Serbian media reported.