Can someone explain why the Trump team, who don't see Russia as a threat but does see China and Iran as a threat, are abandoning joint military exercises with Europe when Russia, China and Iran are conducting joint military exercises?

https://edition.cnn.com/2025/03/10/asia/iran-china-russia-joint-navy-drills-intl-hnk/index.html

See a cnn article about the joint military exercise.

What's the reasoning behind all this?