KIEV, Ukraine (Reuters) - Ukraine denied Monday a report it had sold tactical nuclear weapons to al Qaeda, saying it had never controlled the former Soviet arms on its territory which had passed straight into Russian hands. Sunday, the pan-Arab al-Hayat newspaper quoted sources close to al Qaeda as saying the group bought the weapons in suitcases in a deal arranged when Ukrainian scientists visited the Afghan city of Kandahar in 1998. But Ukrainian officials said its scientists could not have acquired such weapons, as Russia controlled nuclear warheads left in Ukraine after the Soviet Union fell in 1991 and...