Russia and China vetoed a U.N. Security Council resolution on October 4, 2011, effectively tossing a life preserver, according to the New York Times, to Syria’s president. The toothless proposal would have condemned the Syrian government for its violent crackdown of popular protests in which more than 2,700 had been killed. The proposal’s language had been softened from targeted financial sanctions; the council would merely have been charged with considering unspecified measures after a 30-day period. Two reasons can be cited for the two vetoes: commercial ties and a vested interest in forestalling any more threats to the doctrine of national sovereignty.
The full essay is at "Tyranny of the Veto: Eviscerating the UN."