Secretary of State Mike Pompeo accused Russia of "flagrantly" violating the multilateral deal, with which the U.S. is now set to end compliance in six months.
Officials says the COVID-19 pandemic won't affect nuclear preparedness, but military exercises and deployments are being scaled down and canceled, and plans are being put in place to sustain essential operations.
Exclusive: Now that the U.S. has deployed a new nuclear weapon, the options presented to President Trump to respond to Tehran will automatically include a nuclear option.
President Donald Trump said he thinks North Korea's Kim Jong Un is a "man of his word" after the despot warned the world that Pyongyang will soon have a "new strategic weapon."
Bolton, whom Trump ousted from the position in September, wrote in a tweet that more "effective" policy would be needed to keep the United States and its allies safe from North Korea.
The former national security advisor said he does not think North Korea will ever voluntarily surrender its nuclear weapons, regardless of what Kim Jong Un tells Trump.
Both Russia and the U.S. have accused the other of violating the Cold War-era pact that banned ground-launched nuclear and conventional missiles with ranges from 310 miles to 3,417 miles.
Little of note has been achieved in the 18 months since President Donald Trump and Kim Jong Un signed a vague agreement on denuclearization in Singapore.