State Department spokesman blasts 'dangerous' comments by Russian leader, who hinted at use of tactical nukes, told Kremlin 'such a threat is rising'

Moscow blocks joint declaration after quinquennial summit due to 'political' language in text Washington says relates to safety concerns over Zaporizhzhia nuclear plant in Ukraine

Moscow denounced what it said were 'political' aspects of the document

In response, Putin says nukes should 'never be unleashed' since there would be 'no winners' in such war

As treaty set to expire in 2026, US president says Moscow 'should demonstrate' a readiness to negotiate despite its 'brutal and unprovoked aggression in Ukraine'

Tehran's envoy to the IAEA tweets that ignoring Israel's purported nuclear program 'sends a negative message' to members of the Non-Proliferation Treaty

Vague terms, including 'nuclear threshold' state, are less frightening to Tehran than Israel hopes, leaving Jerusalem to choose from flawed approaches in nuclear race

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

Reactor appears to be getting most extensive new construction work in decades, satellite photos show; reason unclear

Tehran appears to be jockeying for position ahead of nuke deal talks by blackballing inspectors and threatening to increase enrichment, but the posturing carries dangerous risks