Former Russian President Dmitry Medvedev on Thursday told U.S. President Donald Trump to remember that Moscow possessed Soviet-era nuclear strike capabilities of last resort after Trump told Medvedev to "watch his words".

Medvedev currently serves as Deputy Chairman of the Security Council of the Russian Federation. Notably, he is now a trusted ally of Russian President Vladimir Putin.

In a warning to Russia, President Donald Trump said Friday he's ordering the repositioning of two U.S. nuclear submarines “based on the highly provocative statements” of the country's former president,