The Kremlin said on Tuesday it had not received any clarification from the United States on remarks around a possible resumption in nuclear testing.

President Donald Trump last month ordered the U.S. military to immediately restart the process for testing nuclear weapons.

But he did not make clear if he meant flight-testing of nuclear-capable missiles or a resumption of tests involving nuclear explosions - something neither the U.S. nor Russia has done for more than three decades.

Moscow has said it would like Washington to clarify the situation.

Asked about the matter on Tuesday, Kremlin spokesman Dmitry Peskov told reporters that Moscow had not yet received any explanation from the U.S. side on what kind of testing Trump was referring to.