The US National Security Adviser warned Washington to respond decisively and caused Russia to suffer catastrophic consequences if using nuclear weapons in Ukraine.

If Russia crosses that line, there will be catastrophic consequences for them.

US National Security Adviser Jake Sullivan at a press conference at the White House in June last year.

Sullivan did not specify how the US would react but said Washington had explained what Moscow was exactly exactly exactly what.

Sullivan's comment was the latest US warning to Russia after President Putin in the speech on September 21 implied that nuclear weapons could only be used if the country's territorial integrity was violated.

US President Joe Biden in his speech at the United Nations General Assembly in New York in the middle of the week's allegations for the Russian counterpart to disregard the responsibility of not disseminating nuclear weapons when publicly published nuclear threats.

Russia owns the largest nuclear arsenal in the world with about 6,000 nuclear warheads and huge continental ballistic missiles (ICBM).