Ukraine's ambassador to US says Russia used a vacuum bomb on Monday

Smoke billows over the town of Vasylkiv just outside Kyiv. File picture. Picture: DIMITAR DILKOFF/AFP via Getty Images

Ukraine's ambassador to the United States appealed to members of the US Congress for more assistance on Monday as her country resists a "brutal war" from Russia, saying Russia had used a vacuum bomb on Monday in its invasion of Ukraine.

"They used the vacuum bomb today, which is actually prohibited by the Geneva convention," Ambassador Oksana Markarova said after a meeting with lawmakers.