The US Ambassador to the United Nations, Linda Thomas-Greenfield, has warned China against crossing a "red line" if it provides lethal support to Russia in its war in Ukraine. This warning comes after US Secretary of State Antony Blinken said China is considering providing such support to Moscow. The tensions between Washington and Beijing have heightened as the latter is suspected of sending a surveillance balloon floating over US airspace recently.

Over the past year, Russia has been making attempts to take over Ukraine and US intelligence has indicated that China is considering sending weapons, ammunition or other lethal aid to Moscow. Secretary Blinken warned China about the possible consequences in the meeting with China's top foreign policy official, Wang Yi.

In an interview on CNN's "State of the Union," Ambassador Thomas-Greenfield said, "We welcome the Chinese announcement that they want peace because that's what we always want to pursue in situations like this.