He had stopped over briefly in Prague for a handshake with Russia's president, Dmitry Medvedev, on a new strategic arms-reduction treaty-and a new start also, it is hoped, in relations with America's still prickly cold-war rival. And then Barack Obama was due back in Washington to play host to more than 40 heads of government for his own nuclear-security summit on April 12th and 13th. Mr Obama wants pledges from them to secure nuclear materials around the world and to crack down harder on illicit traffickers, ahead of next month's five-yearly review of the Nuclear Non-Proliferation Treaty, the world's main bulwark against proliferation and nuclear terrorism.
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