The United States and Russia are close to signing an agreement to help control the trafficking of shoulder-fired antiaircraft missiles, a weapon highly prized by terrorists, the Russian defense minister said during a visit here on Tuesday. The minister, Sergei B. Ivanov, said the deal had been negotiated rapidly during the past several months, and he predicted that “this agreement is sure to be signed pretty soon.” During a joint news conference, neither Mr. Ivanov nor Defense Secretary Donald H. Rumsfeld provided details on the agreement.Full Story