Economically (not in any particular order):
1. Trump doesn't expect any country to stop trading with China just like he doesn't expect the US to stop trading with China.
2. Trump wants fair trade/trade practices from China and he is using tariffs to enforce it. He expects other countries to not allow China to use them as a way to bypass those tariffs.
3. He wants to protect the USD's status in global trade and reserve currency status. He will also use the threat of tariffs to accomplish that.
Militarily:
1. Trump considers China to be the primary threat.
The US Congressional Select Committee confirmed that the Chinese base installed during the Kirchner era in Neuquén, along with the San Juan observatory and a facility in Río Gallegos, are used for military intelligence and electronic warfare purposes by the Communist Party of China.