The United States warned Russia and Belarus at a U.N. arms control meeting Thursday not to deploy nuclear arms in Moscow's neighboring ally following the Russian invasion of Ukraine.

"Any movement of Russian nuclear weapons into Belarus would be dangerously provocative and further destabilize the region. We call on Belarus to reject Russia's policies of nuclear threat and intimidation," U.S. envoy Aud-Frances McKernan told the Conference on Disarmament (CD) in remarks provided by the U.S. mission.

Her comments come as the Geneva-based CD debated Russia's invasion after Kyiv accused Moscow at the forum of "violating all key disarmament treaties."