US defense chief says Russian forces moving into positions 'to be able to conduct an attack'; Ukrainian soldier killed amid 'dramatic increase' in clashes with separatists

New film 'Adventures of a Mathematician' follows Stan Ulam, who lost nearly his entire family in the Holocaust, as he helps his new homeland's nuclear efforts during and after WWII

Top official tells Wall Street Journal that Tehran could be getting a 'bargain,' as talks set to resume in Vienna next week after months-long hiatus

IAEI reports 'no progress' with Tehran over monitoring its nuclear program; Washington 'disappointed,' doubts Iran's seriousness ahead of negotiations next week

US Defense Department assessment says Beijing could have over 1,000 nukes by 2030, 2.5 times more than estimated a year ago

South Korean officials express 'deep regret' over test firing; Japan lodges 'strong protest' through diplomatic channels

Mother of journalist Farzad Bazoft says documents relating to UK connections to so-called supergun were stolen from him days before he traveled to Baghdad

Gadi Eisenkot appears to imply US exit from accord was a mistake; also pans 'irresponsible' comments on covert Israeli actions, in seeming criticism of former Mossad chief, PM

Stockholm International Peace Research Institute says standstill could impact non-proliferation treaties as non-nuclear states question their own commitments

Moscow's Defense Ministry says Tu-22M3 planes will take part in training missions; deployment marks first time since Cold War that Moscow has stationed heavy bombers in Mideast