I'm not sure any of these things are really enforceable short of someone taking military action? I think Russia has broken loads of agreements re Ukraine and nothing very much usually happens.
Even NATO article 5, I'd expect if Russia rolls into Lithuania Trump would ignore it.
The two main enforcement mechanisms are economic sanctions and military aid, which even the EU has been involved with. Economic sanctions haven't had much impact but coupled with military aid has stopped Russian progress in the invasion. The problem is, with the US pulling out, EU big shoes to fill with military aid.
Even NATO article 5, I'd expect if Russia rolls into Lithuania Trump would ignore it.