BERLIN (Reuters) - President Barack Obama will announce on Tuesday he will pursue a new reduction in deployed nuclear weapons, aiming to cut them by up to one third below the level achieved in the last "New START" treaty with Russia, a senior administration official said. "The President will also articulate the goal of reducing U.S. and Russian tactical nuclear ...

World leaders appealed to allies of Bashar al-Assad to force the Syrian President to surrender power at the close of their two-day summit in Northern Ireland.Related StoriesSyria crisis: G8 nations agree to revive peace talks but Vladimir Putin dashes hopes of immediate breakthroughSyria crisis: World leaders appeal to allies of Bashar al-Assad to force the Syrian President to surrender power'Biggest ...

In a speech in Berlin on Wednesday, the President Obama will resume a drive toward disarmament that had been largely shunted aside.    

World leaders appealed to allies of Bashar al-Assad to force the Syrian President to surrender power at the close of their two-day summit in Northern Ireland.Related StoriesG8 summit: Leaders overcome 'fundamental' differences to pave way for end to Syria crisis but future of Bashar al-Assad unclear after resistence from Vladimir PutinSyria crisis: G8 nations agree to revive peace talks but ...

By Andrew Osborn and Oliver Holmes ENNISKILLEN, Northern Ireland/BEIRUT (Reuters) - Differences between Russia and the West mean an international peace conference on Syria is now unlikely before August, a source at a meeting of Group of Eight leaders said on Tuesday as surging government forces brought heavy fighting to Aleppo. World leaders called for peace talks to be held ...