The Wolfowitz Doctrine

In short, the Wolfowitz Doctrine says that the USA should

“prevent the re-emergence of a new rival, either on the territory of the former Soviet Union or elsewhere that poses a threat on the order of that posed formerly by the Soviet Union."

Obama's do-nothing policy did not prevent anything but conduced exactly to that scenario. Now America is striving to regain its former hegemonic position.It is called Trade War.