KYIV, Sept 7 (Reuters) - Russia launched its largest air attack of the war on Ukraine overnight, setting the main government building on fire in central Kyiv and killing at least four people, including an infant, Ukrainian officials said on Sunday.

An early morning Russian attack on Friday killed three people in northern Ukraine’s Sumy region, a regional official reported. Ukrainian President Volodymyr Zelenskyy said Moscow’s attempts to advance in the Sumy area had failed with heavy losses, and Russian operations in the region were being “completely foiled by our forces”.

Ukrainian President Volodymyr Zelenskyy warned that Donald Trump’s China-linked sanctions plan could weaken pressure on Russia, urging swift punitive measures as Moscow escalates strikes on Ukraine.

An attack over the weekend set a new record for the largest single attack on Ukraine since the war began. It involved at least 800 drones and a dozen missiles, with at least some of them targeting the capital. For the first time, Russia struck a Ukrainian government building, home to Ukraine's prime minister and her cabinet.