UNITED NATIONS (Reuters) - As the United States pushes for an end to the U.N. arms embargo on Somalia, U.N. monitors are warning that Islamist militants in the Horn of Africa nation are receiving weapons from distribution networks linked to Yemen and Iran, diplomats told Reuters. The U.N. Security Council's sanctions monitoring team's concerns about Iranian and Yemeni links to arms supplies for al Shabaab militants come as Yemen is asking Tehran to stop backing armed groups on Yemeni soil. Last month the Yemeni coast guard and the U.S. ...