Poland on Tuesday agreed to a new version of a deal on stationing an American missile shield, a government statement said, adding it would be aimed essentially at potential threats from Iran. Warsaw "accepts signing a protocol modifying the accord signed by the Polish and American governments on the installation on our territory of anti-ballistic missile interceptors concluded in Warsaw on August 20, 2008," it said. In September, US President Barack Obama shelved a plan by his predecessor George W. Bush to deploy a missile shield in Poland and a radar base in the Czech Republic by 2013 that Russia...