"These are the enemies of everything we hold dear in America (Russia and China). Your children must kill them for us."
This is the meaning I take from this statement: It's not literal. Obama would be stupid beyond stupid if he tried to pick a literal war with China or Russia. I take this to mean that the new infrastructure Russia and China are putting in place (their own internet, their own Swift system, new economic relationships that exclude the USA = FED, IMF, World Bank, Bank of International settlements such as BRICS, SCO and so on...) and those nations who engage in those BRICS-based alternatives, become targets of the U.S. in whatever forms the U.S. decides to implement, eg: trade sanctions, trade agreements, military actions, share market crashes, misinformation in the media, manipulation of election votes, and so on...
“If the Russian side needs it, we will provide necessary assistance within our capacity” - Chinese Foreign Minister Wang Yi, 22 December 2014.