A decision by China and Russia to veto new United Nations sanctions on North Korea pushed by the United States shattered any veneer of global cooperation, straining efforts to pressure Pyongyang as it prepares to conduct a new nuclear test.

The two countries on Thursday 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.

U.S. officials slammed it as a "sharp departure from the Council's track record of collective action on this issue."