Cause and 'people responsible' for India train crash that killed hundreds have been identified, rail minister says

Russia warns United States: don't brandish ultimatums on arms control

US says it wants dialog with Russia and China on nuclear arms control

NATO official calls for transparency over nuclear weapons

US to stop giving Russia some New START nuclear arms data

Monitoring equipment returns to only some Iranian sites -IAEA reports

US urged not to use bomb-grade uranium in nuclear power experiment

Lukashenko offers nuclear weapons to nations willing 'to join the Union State of Russia and Belarus'

US default fears spark clearing house collateral scrutiny

Germany falls into recession as inflation hits economy

Hungary gets EU's OK to amend Russian nuclear plant contract

Russian forces dig in at Ukrainian nuclear plant, witnesses say