(CNN) US Secretary of State Mike Pompeo harshly criticized a veto by Russia and China of a United Nations security council resolution that would allow humanitarian aid to reach Syrian rebels, calling the action "shameful."

"Russia and China, who have chosen to make a political statement by opposing this resolution, you have blood on your hands," Pompeo said in a statement Saturday.

Pompeo said the draft resolution would have helped aid reach at least four million in Syria.

"Both countries preferred instead to provide cover and support for its junior partner in Damascus; thus placing the lives of millions of innocent civilians in the balance at the height of winter, while further threatening civilians by supporting the continued Assad regime and Russian military," he said.

The draft resolution -- vetoed by Russia and China on Friday -- would have allowed aid deliveries across the border from Turkey and Iraq. The draft proposed by Belgium, Germany and Kuwait called for 12 more months of aid to be sent from two points in Turkey and one in Iraq.

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