The United States warned China of serious consequences if it provided arms to support Russia's invasion of Ukraine, as Kyiv's top general visited the frontline town of Bakhmut where Ukrainian defenders were holding out against constant attacks.
Air raid sirens blared in the capital Kyiv and other cities overnight and a Russian missile strike killed one person in the western town of Khmelnitskyi, Mayor Oleksandr Symshyshyn said on the Telegram messaging app.
Washington and its NATO allies are scrambling to dissuade China from providing military aid for Moscow's war, making public comments on their belief that Beijing is considering providing lethal equipment possibly including drones.
Western fears of China helping to arm Russia come as Moscow's forces struggle to make gains around key objectives in eastern Ukraine, and as Kyiv prepares a counter-offensive with advanced Western weapons including battle tanks.
"Beijing will have to make its own decisions about how it proceeds, whether it provides military assistance - but if it goes down that road it will come at real costs to China," White House national security adviser Jake Sullivan told CNN's "State of the Union" programme.
While China had not moved forward in providing that aid, neither had it taken the option off the table, Sullivan said in a separate interview on ABC's "This Week" programme.
Beijing has refused to condemn Moscow's attack on Ukraine, most recently at a meeting of the Group of Twenty (G20) in India on Saturday. It published a ceasefire proposal on Friday, the first anniversary of Russia's invasion of Ukraine, but the offer was met with skepticism among Ukraine's Western allies.
CIA Director William Burns also weighed in regarding China in an interview aired on Sunday, saying the U.S. intelligence agency was "confident that the Chinese leadership is considering the provision of lethal equipment".
