US Secretary of State Hillary Clinton has called for an international summit on Afghanistan, hinting Iran could also play a role. Addressing other NATO foreign ministers in Brussels, Clinton said the UN conference could be held as early as the end of March.‘‘We have presented this idea, which is being discussed – nothing has been decided – as a way of bringing all the stakeholders and interested parties together,” she told reporters. “If we move forward with such a meeting, it is expected that Iran would be invited as a neighbour of Afghanistan.’‘ At her first NATO summit, Clinton said she hoped the planned conference on Afghanistan, which she decribed as the alliance’s biggest military challenge, would establish a common set of principles to allow the country to move forward. The US Secretary of State, who had pressed for a fresh start in relations with Russia, praised the military bloc’s decision to restore formal ties with Moscow. ‘‘Ministers reached an agreement to formally resume the NATO-Russia Council, including at ministerial level, as soon as possible,” NATO Secretary General Jaap de Hoop Scheffer announced. NATO suspended formal links with Moscow last year after Russia’s troops entered Georgia during the conflict over the breakaway region of South Ossetia.