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.

President Trump said Friday the U.S. is positioning two nuclear submarines in “appropriate regions” near Russia, a move he blamed on threatening rhetoric from former Russian President Dmitry Medvedev,