Change in the ravaged Sudanese region of Darfur will never come without sustained pressure from the international community — not only on the Sudanese government but on its enablers in the global marketplace.

The United Nations' resolution last week would have authorized deployment of its peacekeeping troops to Darfur but immediately ran into another barrier. Sudan was given veto power over the arrangement and on Friday exercised it, witholding its approval.

This was hardly a surprise; the government in Khartoum has steadfastly resisted the notion of U.N. troops interceding in its internal rebellion, and its permission was made a condition of deployment. This time around, the resolution never would have passed without that out clause.

But the outrage of the continuing genocidal violence in Darfur — and of the failure of global powers to stop it — mounts with every passing day. World diplomatic leaders must turn up the heat beneath Sudan, and not gently.

Two nations sitting on the sidelines are China and Russia. Both of them abstained from voting on the U.N. measure, mild-mannered as it was. Their self-interest was clear: Russia is a principal supplier of weapons to Sudan and China is a major consumer of its oil.

The U.S., Great Britain and other world powers must now use their own influence on these holdouts to persuade them to support a new resolution, one with teeth in it.

American diplomatic officials say there's a move toward direct talks with Sudanese leaders, and this must be pursued, with the participation of the president, if necessary. If Sudan responds to this high-level persuasion, all the better.

Otherwise, the time is long overdue for sanctions to be imposed on Sudan, unless it accepts the participation of a U.N. force. While the Security Council was debating this resolution last week, the Sudanese military was dropping bombs on rebel-held villages, impervious to the loss of civilian life. The suffering of those civilians at the hands of rebel forces continues unabated.

Sudan protests that a U.N. force would overrun its own sovereign control. But clearly any nation where violence has continued unabated for so long is out of control, and must yield enough power to bring the suffering to an end.