How do “neo-realists” support their view that the US can simultaneously exit NATO and convince the EU to cut their economic ties with China?

"Neo-realists" (like John Mearsheimer) argue that the US should simultaneously exit NATO (because the US should focus on the Chinese threat in Asia) and convince the EU to cut all economic ties with China, i.e. stop "feeding the beast" to quote Mearsheimer.

These two goals seem at odds with each other, if one considers that e.g. the US had trouble getting the EU to mirror much of its trade war with China. And where the US was somewhat successful was in lobbying against Huawei in European countries that the US has very good defense relations with. Assuming the US exists such a close defense relationship, it's somewhat hard to see how they could convince many EU countries to do much of anything that the US wants. So how do the "neo-realists" propose that the US can influence EU economic policy (vis-a-vis of China) after the US exits NATO?