Russia has declared it will no longer observe self-imposed restrictions on deploying medium- and short-range missiles, ending a moratorium introduced after the collapse of the Intermediate-Range Nuclear Forces Treaty with the United States.

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.

Days after President Donald Trump said he deployed nuclear submarines ‘in the region’ of Russia, the Kremlin has issued a warning to the world. Trump said nuclear submarines are near Russia after previous threats from officials in the country.