Suzana Vasiljevic, Serbia’s President Aleksandar Vucic media advisor, said on Friday the meeting with Richard Grenell, the US head of state Donald Trump’s envoy to Kosovo, was challenging, but could not go into the details of the talks, the Beta news agency reported.

Speaking to the Prva TV, Vasiljevic said the two spoke alone in the first ten minutes, after which the head of Serbia’s Government Office for Kosovo and Metohija Marko Djuric joined the meeting.

“What is unusual is that the President was taking notes himself for the first time. The talks were apparently extremely tough and he (Vucic) was not in a mood to talk about it even with us,” Vasiljevic said.

She added it happened before that meetings, especially with the Kosovo issue on the agenda, were difficult, but never so tough that the President didn’t want to talk about it with his associates, and decided to take some time to think about that and about the way how to say what would be a solution he had heard from Grenell.

After meeting with Grenell, a statement from his office said Vucic told the envoy that a compromise, which would be in the interest of stability and the future of the whole region, could be achieved with the respect of Serbia’s legitimate interests.

The statement quoted Grenell as saying the two sides would have to “cooperate closely and quickly, looking at the future.”