SEOUL, Oct. 11 (UPI) -- North Korea showed off its new Hwasong-20 intercontinental ballistic missile at a military parade, state-run media reported on Saturday, touting it as the North's "most powerful nuclear strategic weapon." The parade, held on Friday night at Kim Il Sung Square in Pyongyang, was attended by foreign dignitaries including Chinese Premier Li Qiang, Vietnamese Communist Party chief To Lam and Russian ex-President Dmitry Medvedev , the official Korean Central News Agency