Kremlin spokesperson Dmitry Peskov noted that U.S. submarines "are always on alert," claiming that Russia is not interested in escalating tension between the two nations.

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.