China is the world's manufacturing powerhouse. It's very difficult to get the economic leverage to sanction China, and convincing developing nations to go along would be virtually impossible.
You don't buy from them. This is already happening [1] [2] [3]. Developing nations have no purchasing power compared to the developed world. They'll kowtow to developed world hegemony if push comes to shove (at least within the scope of US foreign aid [~$40B/year] and dollar dominance).
[1] https://www.google.com/search?q=manufacturing+moving+away+fr...
[2] https://www.freightwaves.com/news/manufacturers-move-away-fr...
[3] https://www.cnbc.com/2022/10/20/china-factory-of-the-world-i...