Trump's "Board of Peace" to which he says Putin has accepted a membership invitation, seems to me like an overt effort on his part to establish executive power to usurp the UN.
Domestically Trump has nakedly targeted US government organisations, oversight systems and democratic norms to expert control, often framing such actions as dismantling a "corrupt`'` establishment or enforcing loyalty. e.g Dept of Justice and FBI, the Intelligence Community, Federal Agencies ( eg ICE) and the Civil Service, Electoral and Legal systems. Now he's doing it in plain sight on the world stage.
Accepting membership, in my view, is a poisoned chalice- and anyone who agrees to be a member runs a risk of becoming, over time, by coercion and/or threats of retaliation, a supplicant to Trump's world view and his aims.