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

Russia said on Monday that everyone should be "very, very careful" about nuclear rhetoric, responding to a statement by U.S. President Donald Trump that he had ordered a repositioning of U.S. nuclear submarines.

Kremlin spokesman Dmitry Peskov emphasized that Russia does not view the latest movement as an "escalation" but claimed people were reacting emotionally on both sides.