State Department says Moscow unilaterally postponed meeting as Russian deputy FM rails at American 'reluctance to listen to our signals and reckon with our priorities'

Pyongyang ups rhetoric against rivals' ongoing military drills, warning it will use nuclear weapons if Washington or Seoul attacks; accuses Pentagon of planning regime collapse

Russian leader repeats claim Ukraine plotting to set off a 'dirty bomb' in a false flag attack as defense chief discusses allegation with his Chinese and Indian counterparts

Analyst says Russia's allegation 'just noise' for now; most believe there's little chance false flag attack could really be used as a pretext for nuke detonation

'The Ukrainians are not building a dirty bomb,' US military official says, after Moscow claims that Kyiv may deploy an unconventional device

Nearly half of alliance's members taking part in annual exercises, which come as Putin threatens to use any means to defend Russian territory

After Russian threats to utilize such weapons against Ukraine, US Defense Secretary Lloyd Austin says 'irresponsible and reckless rhetoric is dangerous'

Josep Borrell suggests Putin 'cannot afford bluffing' and says those backing Ukraine -- including NATO and the US -- 'are not bluffing neither'

US has no indications Moscow is preparing weapons of mass destruction, but president's warning could have consequences as other countries, including Russia, take note

Spokesperson says no signs Russia will imminently use weapons of mass destruction, after president raised 'prospect of Armageddon' in response to Putin's threats