The problem is these joint scientific efforts were and continue to be effective tools to diffuse more dangerous possibilities.

In case you have forgotten Russia is still the 2nd largest nuclear power and their arsenal is enough to eliminate pretty much all life on Earth.

The war in Ukraine is terrible but don't underestimate how much worse things could get. If things do get worse it's back channels like space collaboration/UN/other symbolic things that can keep people talking enough to not end up cleansing the Earth in nuclear fire. Just because those things are ineffective at stopping a proxy war doesn't mean they aren't worth doing.

For the same reason I also agree that China should be welcomed into the international space community. They are flying state of the art rockets and have their own modern space station... you couple that with the fact they too are an increasingly powerful military nation then more collaboration rather than less is the way to go.