BUCHAREST, Romania (AP) — Romania says it blocked a Russian military shipment to Serbia because of international sanctions that are in place against Moscow over actions in Ukraine.

The Foreign Ministry said in a statement Friday it could not issue a transit permit for the shipment due to a European Union embargo introduced in 2014. The statement gave no more details.

Serbian officials said this month that NATO- member Romania had blocked the delivery of some 60 Russian battle tanks and armored transport vehicles that were to be shipped via the Danube River.

Media reports say Russia flew 10 armored vehicles to Serbia this week.

Russia has been helping Serbia beef up its military, raising concerns in the region that went through a war in the 1990s.