NATO will 'respond' if Russia uses chemical weapons in Ukraine: Biden

"We will respond if he uses it. The nature of the response would depend on the nature of the use," Biden said after a NATO summit in Brussels.

US President Joe Biden said Thursday that NATO would "respond" if Russian President Vladimir Putin used a chemical weapon in his war on Ukraine.

A file photo of a Russian armored personnel carrier burning amid damaged and abandoned light utility vehicles after fighting in Kharkiv, Ukraine (AP)

"We will respond if he uses it. The nature of the response would depend on the nature of the use," Biden said after a NATO summit in Brussels.