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

Senior Russian official stands by Tehran's claim that US drone was shot down in Iranian airspace, defends rights of foreign troops to remain in Syria despite Israeli opposition

At Jerusalem summit with Israeli, Russian counterparts, Trump security adviser says talks possible if Tehran renounces nukes, ballistic missiles, terrorism

Iran’s efforts to entrench itself militarily in Syria and escalating tensions between Tehran and Washington expected to top agenda

At Jerusalem meet ahead of trilateral summit, Moscow's national security adviser promises to pay 'special attention to ensuring Israel's security'

American guided-missile cruiser and Russian destroyer come within 50 meters of each other in the East China Sea; no injuries reported

Aircraft's pilot and crew put 'at risk' by high-speed pass directly in front of it, 6th Fleet claims

US official quoted saying Trump administration told Kremlin it supports Israeli action so long as Iranian forces remain in the country

Arabic newspaper quotes western diplomats on offer to recognize Syrian president to be proposed at upcoming meeting in Jerusalem of US, Israeli, Russian national security advisers

Speaking to reporters, US president appears to walk back tweet of admission of Moscow's 2016 tampering, says Kremlin 'didn't help him at all'