Vladimir Putin has been accused of using deadly vacuum bombs in Russia's ongoing invasion of Ukraine.
The Ukrainian ambassador to the U.S. Oksana Markarova said the Kremlin had used the devastating bomb - which is banned by the Geneva convention - during air strikes.
More than 520,000 people are now said to have now fled Ukraine as refugees, with Vladimir Putin being accused of "war crimes", after residential areas in the city of Kharkiv were bombed by his regime
