The Bush administration is hoping to persuade Russia to formally join a growing alliance of countries prepared to undertake interdictions to halt the trade in weapons of mass destruction, senior U.S. officials say. Russia is the only member of the Group of Eight major industrial nations that is not yet a member of the Proliferation Security Initiative and the administration would like to see that absence remedied in time for the U.S.-hosted G8 summit at Sea Island, Georgia, in June, the officials told Reuters. The so-called PSI is aimed at halting the flow of nuclear, chemical and biological weapons-related materials and missiles bound for states like North Korea and Iran. Full Story