Talk is cheap for most people; it's free from Westerners, who expect all their politicians to lie. A Western politician will shake your hand and talk about friendship/cooperation then go back home and do a live interview about how he's proposing laws to ban things to your country and sanction you. Judge these people by their actions, not their words. When France drops out of NATO, tells the US that it will not follow any bans for technology or items to and from China, and progressively drops dollar for yuan, then we can talk about how sincere he is and how much he deserves in return. Before then, a turd sprinkled with little flowers (and apparently also an expensive watch half embedded in it) is just another turd.
It's not all white and black either. If client states such as France can give tangible benefits to China, then these benefits were real, even if they don't come with an official declaration of independence or move to China's bloc.
There's no point in not doing diplomacy with them, none of these deals have ever shown to have hurt China, otherwise, the economy wouldn't be booming and Beijing wouldn't be the biggest economy.
In the thousands of years were imperials from the central plains dominated Asia, we can observe that rebellion almost never happens through one warlord just standing up in a room full of the other warlords and telling the emperor to fuck himself. So it is unrealistic to expect that this will happen in the US empire as well.
When the betrayals come in, its usually when the empire is in dire straits, the emperor rallies the vassals to fight outsiders... when it's time to gather all forces, some vassals will just not show up.