At least ten countries have officially notified the United Nations that they will participate as observers at the first meeting of signatories to a treaty banning nuclear weapons slated for March in Vienna, sources familiar with the matter said Friday.Japan, which relies on the U.S. nuclear umbrella for its security and is not one of the treaty's 86 signatory countries and regions, is facing growing calls to join the meeting as an observer as it is the only country to have experienced atomic bombings."We urge the government of Japan...to swiftly sign and ratify the treaty," the Japan Confed…READ FULL ARTICLE