You can disagree with this opinion by Joschka Fischer, Germany’s foreign minister and vice chancellor from 1998 to 2005, was a leader of the German Green Party for almost 20 years, writing in Project Syndicate.
“American hegemony has given way to a new formulation based on rivalry and competition among several major powers, where there is no longer a fixed, codified set of rules. Instead, there is only economic, technological, and military power, which implies a greater risk of conflict and even war between nuclear heavyweights.”
HOWEVER, you should also consider how the erratic, irresponsible behavior of President Trump is making things a lot worse and providing advantages to China and Russia.

You can’t be a bully and a malignant narcissist AND a responsible world leader.

