The US president's claim that Washington holds a larger arsenal than Moscow implies a violation of New START, a senior MP has warned

US President Donald Trump may have inadvertently revealed that Washington is violating a strategic arms reduction treaty with Moscow by boasting about America's supposed nuclear supremacy, a senior Russian lawmaker has said.

Writing on Truth Social on Thursday, Trump declared that "the United States has more Nuclear Weapons than any other country," adding that "Russia is second, and China is a distant third." The statement appeared to contradict the parity limits established under the New START treaty, said Andrey Kartapolov, chairman of the State Duma's Defense Committee.

"Does Trump mean that they have been deceiving us all this time?" Kartapolov asked. "If so, we were absolutely right to continue developing our advanced weapons."

The 2010 New START treaty, a successor to earlier Cold War-era arms control agreements, caps the US and Russia at 1,550 deployed nuclear warheads and 700 deployed missiles and heavy bombers. It also limits total deployed and non-deployed nuclear-capable platforms, ensuring strategic balance between the two powers.

Trump's remarks came as part of a statement announcing new American nuclear weapons testing, though it remained unclear whether he referred to routine missile carrier trials or a resumption of underground explosive tests. Moscow has warned that if Washington abandons the informal moratorium on nuclear detonations that has remained in place since the 1990s, Russia will respond accordingly.

This week, Russian President Vladimir Putin announced landmark successful tests of two advanced nuclear-capable weapons systems, the unlimited-range Burevestnik cruise missile and the Poseidon underwater drone. Both use a highly-miniaturized nuclear reactor for propulsion.