US says China is boosting Russia's war machine in Ukraine

China is supporting Russia's war effort in Ukraine by helping it ramp up Moscow's defense production by providing large amounts of machine tools, microelectronics, drone and cruise missile technology, senior U.S. officials said on Friday.

The officials, speaking on condition of anonymity, said U.S. President Joe Biden raised the issue with Chinese President Xi Jinping in their recent phone call and that it is a source of ongoing discussion with U.S. allies in Europe and around the world. (Reporting By Steve Holland and Susan Heavey)