text:  BBC News with Emily Thomas. Russia has launched a wave of airstrikes on cities in Ukraine, killing at least 28 people and injuring dozens more. One of the buildings damaged in the capital, Kiev, is a children's hospital. Other cities hit include Kriviri, Dnipro and Pokrovsk. Earlier, the Chinese president, Xi Jinping, called on the international community to help Russia and Ukraine resume direct dialogue about an end to the war.