Tensions between China and the U.S. just got hotter. China has warned that any country choosing to side with the United States on trade matters should expect retaliation. The message is clear: if you back Washington’s trade policies, Beijing won’t sit back quietly.

Officials in China didn’t give exact details on what kind of retaliation they’re planning, but experts say it could mean anything from trade restrictions to cutting off access to certain Chinese markets or resources. The warning comes as the U.S. continues to tighten its rules on China—especially in tech and manufacturing—and urges its allies to do the same.

This could put countries around the world in a tough spot, especially those that rely on both economies. With China taking a more aggressive tone, the global trade landscape might be in for some serious shifts.

Stay tuned—this could get interesting.