Russia is testing nuclear weapons, and China is testing them too, you just don’t know about it,” Trump said in an interview that aired Sunday.

The event comes only days after the first long-range test of a Poseidon “doomsday torpedo,” which the submarine was designed to carry.

Touting new weapons tests, Moscow signals to Washington that it must contend with the Kremlin’s power and negotiate.

Russia said it tested a nuclear-powered cruise missile and torpedo, two of its experimental weapons, in recent days.

North Korea is one potential villain in a fictional movie about nuclear war on Netflix, Kathryn Bigelow’s “A House of Dynamite.” It is a “Rashomon”-style thriller about the concept of mutually assured destruction that the filmmakers mean to be a wakeup call for nuclear powers.

Dmitri S. Peskov, a Kremlin spokesman, told Russian news agencies that recent drone and missile tests were not nuclear weapons tests.

Russian MP warns US nuclear test plans could destabilize global security, violate CTBT obligations. Follow Newsweek's live blog.

The latest war of words between Trump and Putin started after the latter announced the successful testing of a new, powerful cruise missile called the Burevestnik