US President Joe Biden warned Monday that NATO faces new challenges in dealing with China and Russia, but pledged to renew Washington's support for its allies at the alliance summit.

"I think over the past two years, there's been a growing realization that we have new challenges," Biden said.

"We have a Russia that's not behaving the way we'd hoped, and it's also China."

Sunday, the G7 called on Russia to "stop its destabilizing activities", including interference, and called on it to respect human rights, vowing to "hold accountable" those responsible for carrying out cyber attacks from Russian territory.

In the final statement of the three-day summit, the leaders of the group announced, "We call on Russia to conduct an urgent investigation, to provide a credible explanation and to give credible explanations about the use of chemical weapons on its territory, to put an end to the systematic repression of civil society and independent media, and to identify those responsible for the attacks." electronically by means of ransomware from within its territory.