"President Vladimir Putin on Tuesday suspended Russian participation in the last remaining nuclear arms control treaty with the United States, warning Washington that Russia had put new ground-based strategic nuclear weapons on combat duty," Reuters reports of the new declaration.

It comes over a year after Moscow signed onto a five year extension, and after in August the US accused Russia of violating the treaty in disallowing US on-site inspections under its stipulations. In response, Washington halted Russian inspectors' ability to do the same on American soil.

Russia had at the time complained that it was actually the US side which "deprive the Russian Federation of the right to conduct inspections on American territory."

"No one should be under the illusion that global strategic parity can be violated," Putin said of New START in the Tuesday remarks delivered in Moscow.

In March 2021 the two sides renewed New START for a period of five years, and it will expire in February 2026 if it's not continued - an increasing possibility given US-Russia relations have deteriorated so fast over the Ukraine war they are near complete breaking point. But this new Putin declaration appears to be the final death knell after the treaty's fate was already extremely uncertain.