The Kremlin has tried to calm tensions in a feud between Trump and Medvedev that spiraled into nuclear threats.

Trump also rebuked Medvedev in July, accusing him of throwing around the "N (nuclear) word" after the Russian official criticised U.S. strikes on Iran and said "a number of countries" were ready to supply Iran with nuclear warheads.

The Kremlin tried Monday to defuse tensions caused by remarks from one of Russia’s top officials that led President Trump to shift two nuclear submarines closer to Moscow. “As you know, Russia holds a responsible position.