The comments come as Trump's deadline for Russia to agree a ceasefire with Ukraine or face sanctions edges closer.

President Trump on Monday lambasted the “Russian war machine” responsible for the deaths of innocent Ukrainians — in a sharp escalation of his rhetoric just as special

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.