"In light of these facts", Pompeo said in his statement, "the United States today declares it has found Russian Federation in material breach of the treaty and will suspend our obligations as a remedy effective in 60 days unless Russian Federation returns to full and verifiable compliance".
"Allies have concluded that Russian Federation has developed and fielded a missile system, the 9M729, which violates the INF Treaty and poses significant risks to Euro-Atlantic security", NATO foreign ministers said in a statement after a meeting.
Pompeo said there was no reason why the USA "should continue to cede this crucial military advantage" to rival powers.
"Allies have concluded that Russian Federation has developed and fielded a missile system, the 9M729, which violates the INF Treaty and poses significant risks to Euro-Atlantic security". "At the end of the 60 days, it's going to be a free-for-all".
Accusing Russia of "cheating at its arms control obligations", Pompeo told a news conference in Brussels that Russia has 60 days to return to compliance with the treaty, after which time the United States would suspend its own compliance.
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"The INF has guaranteed peace and security in European territory for 30 years now", Mogherini said as she arrived for talks with North Atlantic Treaty Organisation foreign ministers.
In a news conference at that time, NATO Secretary General Jens Stoltenberg said he believed that, despite Russia's insistence, "the most plausible assessment would be that Russian Federation is in violation of the treaty".
The US has shared intelligence evidence that the ground-fired cruise missile could give Moscow the ability to launch a nuclear strike in Europe with little or no notice.
The INF was a bilateral treaty between the United States and the then Soviet Union, so it puts no restrictions on other major military actors like China. "During the 60 days, we will still not test or produce or deploy any systems, and we'll see what happens during this 60-day period". Meanwhile, it accuses the U.S. of violating the INF by the deployment of the Aegis missile defence system in Romania and Poland, on the grounds that the launchers used in that system for defensive interceptors could be adapted to fire offensive cruise missiles.
China, North Korea, and Iran are not obligated by the treaty's limitations, and, "This leaves them free to build all the intermediate range missiles they would like", he said.
"Russia's violation of the INF Treaty erodes the foundations of effective arms control and undermines Allied security".
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The House hasn't moved on the issue, and Speaker Paul Ryan last week said the Yemen resolution "isn't the way to go". The decision to limit Haspel's briefing to fewer than a dozen senators has angered others, like Sen.