(ANSA-AFP) - BRUSSELS, JUN 14 - US President Joe Biden warned Monday that NATO faces new challenges in dealing with China and Russia, but vowed to renew Washington's support for its allies at the alliance's summit. "I think that there is a growing recognition over the last couple of years that we have new challenges. And we have Russia that is not acting in a way that is consistent with what we had hoped, as well as China," Biden said. (ANSA-AFP).