The country’s new president Rumen Radev made his first trip to Brussels after winning the election with an anti-migrant, pro-sovereign campaign.
He said he feared Donald Trump would smooth relations with Russia while the EU was left on the sidelines with a difficult road ahead.
In a swipe at EU’s own defence plans, he also reiterating an alliance with NATO was essential to the west.
He said: “I have already stated in my speech to parliament that Bulgaria’s choice of the EU and NATO is strategic and should not be called into question.
“As for the sanctions [against Russia], I do not see what is the practical use of them, as the losses are obvious.
“I fear that the new US administration will restore the dialogue with Russia and the EU will remain hostage to the sanction war.”