Bipartisan bill would freeze assets of top Turkish leaders, sanction firms that work with country's military; Norway suspends arms exports

EU chief says political solution is only way to end the Syrian conflict; NATO calls for Turkey to avoid actions that may further destabilize the region

Washington says Ankara's obtainment of anti-aircraft missile system may endanger American warplanes

Washington accuses Moscow of 'sustained and repeated' violations of nuclear treaty after withdrawing from agreement

Prosecutor says Aron Shaviv, former CIA officer and 4 ex-FBI agents under investigation for plotting to overthrow government during 2016 elections

But alliance chief also places blame for demise of INF treaty on Moscow, expresses support for Washington

Acting defense secretary tells Ankara counterpart Washington will halt F-35 sale if S-400 deal goes ahead, but meeting ends without breakthrough

At meeting of military alliance, Jens Stoltenberg says Moscow 'still has an opportunity to save the INF treaty,' but if not 'we need to respond'

After a single day on the job, Mark Esper to meet with fellow NATO defense ministers as US seeks to enlist countries to counter threats to shipping in Persian Gulf

After Putin talks, Turkish president gives indication of timeframe for missile defense system's arrival, which may lead to Washington kicking Ankara out of F-35 fighter jet program