"These morons are actively pushing us towards World War Three," Medvedev said.
After it invaded Ukraine last year, Moscow closed off the Black Sea ports of one of the world's biggest suppliers of grain.
Cuban authorities have been alerted of the extremity of the situation.
"The Romanian Army's radar surveillance system identified a possible unauthorized breach of national air space, with a signal detected on the route to the town of Galati," the defense ministry said.
Ukraine's special forces said on Monday they had killed Sokolov, Moscow's top admiral in Crimea, along with 33 other officers in a missile attack last week.
Ukraine said it conducted a missile strike on a shipyard in Crimea's port of Sevastopol early on Wednesday, damaging multiple naval vessels.
The decision to send ATACMS or GMLRS, or both, still remains unfinalized.
Russia and Ukraine have conducted regular exchanges of prisoners of war, as well as the bodies of dead soldiers, since the Kremlin launched its full-scale invasion in February 2022.
REPORTER’S NOTEBOOK: Nearly four years after I started covering diplomacy, the world is a different place.
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