Dmitry Medvedev referenced a rumored Soviet-era nuclear weapon system during an online disagreement with President Trump.

“Tell Medvedev, the failed former President of Russia, who thinks he’s still President, to watch his words. He’s entering very dangerous territory!” Trump wrote on his Truth Social account early Thursday (July 31) morning, referencing Medvedev, the top ally of current Russian President Vladimir Putin.

President Donald Trump has issued a chilling new threat to Vladimir Putin amid the ongoing war in Ukraine. Originally giving Russia a 50-day deadline to halt attacks or face severe tariffs, Trump is now drastically cutting that timeline after a deadly weekend assault killed civilians in Ukraine.