Iran tests missiles in naval exercises
General Paul Selva, the vice chairman of the Joint Chiefs of Staff, told lawmakers that the missile system's deployment "violates the spirit and intent" of the Intermediate Nuclear Forces Treaty (INF).
"The system itself presents a risk to most of our facilities in Europe," Selva told the House Armed Services Committee hearing.
"We believe that the Russians have deliberately deployed it in order to pose a threat to NATO and to facilities within the NATO area of responsibility."
The treaty was negotiated during the Cold War by president Ronald Reagan and Soviet leader Mikhail Gorbachev, banning intermediate-range missiles from US and Russian arsenals.
It led to the destruction of about 2,700 missiles.
The New York Times last month first reported the deployment.
Russia says it has not violated the treaty -- and has accused Washington of doing so.
Moscow says the missile defense system the United States deployed in Poland and Romania could be used if necessary to launch missiles toward Russia.
The 1987 INF treaty put an end to a mini-arms race triggered by the Soviet Union's deployment of SS-20 nuclear missiles targeting Western European capitals.
NATO at the time responded by deploying US nuclear-tipped Pershing missiles. This led to massive pacifist demonstrations across Europe, and even heated public debates around the German pacifist slogan "better red than dead."
Selva also warned that America's aging nuclear deterrent -- much of it built in the 1970s -- is "nearing a crossroads."
Trump to develop missile defense system against Iran, North Korea
The Pentagon wants to replace or modernize all three legs of its "triad," a three-pronged nuclear attack force comprising intercontinental ballistic missiles (ICBMs), submarines and bombers. Experts estimate the cost will hit $1 trillion over the next 30 years.
"These systems will not remain viable forever," Selva said.
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