U.S. State Department Spokesperson Matthew Miller said this at a briefing in Washington on Monday, according to an Ukrinform correspondent.
"We have made very clear that we don't want to see China do anything to help support Russia's aggression in Ukraine, and we will continue to make that clear," he said, commenting on a planned summit meeting between the Russian and Chinese leaders.
Read also: Kremlin exploiting China and Turkey's initiatives for settlement in Ukraine to discourage Western supportMiller also added that the United States remains concerned about the full-scale partnership between Moscow and Beijing.
Kremlin leader Vladimir Putin plans to visit China in May to hold talks with Chinese President Xi Jinping.