Trump doesn't do "policy". He is mostly trolling, and sometimes rambling. For anyone that doesn't understand or agree with them, they simply don't like you and it would be great if you weren't around.

What Trump is doing was essentially the position of Thomas Dewey, had he been elected President in 1944, but Roosevelt concealed his health problems. Dewey was very specific that Democrat New Deal agencies and programs would be eliminated.

It is the end of cooperative politics and compromise. Given the cognitive impairment, it is likely the beginning of what economists will be calling an "economic adjustment" (administration preferred language) due to AI and wasteful social programs. When cities like Denver want to take out a $1 billion loan to manage their budget, it doesn't bode well. Denver has few economic prospects, and has about $1 billion in existing debt. Los Angeles recently did the same thing.

My best guess is now he thinks if he "owns a piece" so can then use withholding of the technology to the rest of europe to make "deals"/threats