>

One of those most fascinating polling points of the Ukrainian conflict is that fact that upwards of 80% of Russians fully support the conflict whereas upwards of 80-90% of Belarusians oppose the conflict. 
We tend to lump them together but Belarus and Russia are two fundamentally different countries.
Aren’t we a little bit past that point now? >

IF a request like this was signed it would likely be for 1 of 2 reasons
1: Stop Russia from being strengthed during the coming rumored offensive
2: Give Belarus a final chance to reintegrate into the larger European sphere, as assisting Russia with its troops in Ukraine would be the final death knell. Belarus as a country would simply cease to exist as far as the European Markets and Governments would see it.
Edit: I do am have stupid. Knell* >

3) sign it, then claim Ukraine broke it thus giving them an excuse to join the Russian effort further.
This agreement isn't worth anything with Lukashenko and Putin still in play. >

4) He knows the Belarusian military would immediately enact a coup and remove him so signing it is a way to pretend he has power. >

I hear there.  The vast majority of their pop is against attacking Ukraine