Iran has issued a fresh warning to Bulgaria after the Balkan country allowed the United States to use its military bases, escalating diplomatic tensions between Tehran and Sofia.

In a statement posted on social media, Iranian Foreign Ministry spokesperson Esmaeil Baghaei said that “those making decisions in Bulgaria must bear responsibility for the dangerous decision to host a US aerial refuelling aircraft at their military bases.”

The statement added that Tehran believes this is not an isolated case, claiming that similar decisions have been taken before to “support US military operations against Iran.”

“The Bulgarian people know very well that the Iranian people have never had any problems with Bulgaria. For decades, relations between our two nations have been based on mutual respect,” the Iranian Foreign Ministry said.

The latest remarks mark the third time Iran has issued a warning to Bulgaria over the presence of US military aircraft.