I think he means that the US military has a habit of invading countries who sell oil in currencies other than the US$.

_Libya_

2008 https://www.cfr.org/blog/libya-shunning-dollar (Libya Shunning the Dollar?)

2011 Invaded

_Iraq_

2000 https://www.cnn.com/2000/WORLD/meast/10/30/iraq.un.euro.reut... (U.N. to let Iraq sell oil for euros, not dollars)

2003 invaded