Serbia on Friday denied it has exported arms to Ukraine after Moscow demanded to know if its Balkan ally delivered thousands of rockets for Ukraine’s fight against Russia’s invasion.

Serbian Foreign Minister Ivica Dacic said that since the beginning of the war in Ukraine, no weapons have been exported from Serbia to any of the parties to the “conflict.”

“I can say that because my ministry gives the permission for (arms) exports,” Dacic said. “Serbia does not deliver military equipment to any country that we believe would be problematic in any way.”

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Russia on Thursday demanded an official explanation from its ally Serbia about reports that the Balkan country has delivered thousands of rockets to Ukraine.

Russian Foreign Ministry spokeswoman Maria Zakharova expressed “deepest concern” about the reports, which first came from pro-government Russian media last month.

“We are following this story,” Zakharova said in a statement posted on the Russian Foreign Ministry website late Thursday. She added that the possible arming of Ukraine represented a “serious question” for Serbian-Russian relations.

The media reports said a Serbian state arms factory recently delivered some 3,500 missiles for the Grad multiple rocket launchers used by both the Ukrainian and Russian armed forces. The 122 mm rockets were allegedly transported to Ukraine via Turkey and Slovakia.

Serbian Defense Minister Milos Vucevic has denied the country exported the missiles to Ukraine but left open the possibility they could have gotten there via a third party.

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“If private companies buy weapons in third states’ markets and then sell them to other companies in other countries, that is not a question for Serbia, that is international trade,” he said.

Serbia is Moscow’s closest ally in Europe, with historic, religious and cultural ties that are bolstered by decades of pro-Russian propaganda campaigns in the Balkan country.

Russia backs Serbia’s claim over its former province of Kosovo, which declared independence in 2008 with Western support. And Serbia has refused to impose sanctions on Moscow over the invasion.

Western officials fear Russia could use simmering tensions in Kosovo to try to destabilize the Balkans and avert some attention from the invasion of Ukraine.