America and China used to have military ties with each-other until last February when America gave Taiwan (a country China thinks is dumb) like $6.4 billion for weapons or something
China got mega pissed and immediately stopped having military ties with the US.
China claims to have like 1,000+ missiles aimed at Taiwan and says they'll attack if they try to get independence.
Seoooo, this puts America in a sticky situation because if you know anything about America, you'd know that we're in debt to China a lot (like $755.4 billion) and they're being cool about it because they know they have Americas nuts in a vice. This means that if Taiwan tries to get independence, China will attack it. And because Taiwan is one of Americas biggest allies, America will have to defend Taiwan, and thusly creating a whole mess of problems for America.
TL;DR US and China are about to resume military ties.
Source: BBC News