Sudan's embargo

The United Nations set an arms embargo on Sudan in order to mitigate the murder of Darfurians. Yet, it seems Sudan has decided to ignore it. Read here, and here. What's worse is that the arms, and the helicopters transporting the arms, are being supplied by Russia and China. These states are members of the United Nations Security Council, a coaltion that is supposed to act as the world's police-force. They should know better. And they should start acting accordingly.