Russia has suspended its involvement in the Cold War-era Intermediate-Range Nuclear Forces Treaty (INF) following a similar decision by the US.
President Vladimir Putin said Russia would start developing new missiles.
On Friday, the US, which has long accused Russia of violating the treaty, formally announced it was suspending its obligations under the agreement.
Signed in 1987 by the US and USSR, it banned the use of short and medium-range missiles by both countries.
“Our American partners announced that they are suspending their participation in the treaty, and we are suspending it too,” Mr Putin said on Saturday.
“All of our proposals in this sphere, as before, remain on the table, the doors for talks are open,” he added.
Earlier on Saturday, Nato Secretary General Jens Stoltenberg told the BBC: “All [European] allies agree with the United States because Russia has violated the treaty for several years. They are deploying more and more of…