UNITED NATIONS, Oct 5 (Reuters) - The United States accused China and Russia on Wednesday of enabling North Korean leader Kim Jong Un by protecting Pyongyang from attempts to strengthen U.N. Security Council sanctions imposed over its nuclear weapons and ballistic missile programs."In short, two permanent members of the Security Council have enabled Kim Jong Un."The 15-member council met on Wednesday on North Korea after nuclear-armed North Korea test-fired a ballistic missile on Tuesday that soared over Japan for the first time in five years and prompting a warning for residents there to take cover.In May, China and Russia vetoed a U.S.-led push to impose more U.N. sanctions on North Korea over its renewed ballistic missile launches, publicly splitting the U.N. Security Council for the first time since it started punishing Pyongyang in 2006.In recent years, veto powers China and Russia have suggested U.N. sanctions on North Korea be eased for humanitarian purposes and to entice Pyongyang back to stalled international talks aimed at persuading Kim to denuclearize."