I think the invasion and death and destruction in Ukraine is a bit more than a squabble, plus it involves China to some extent.
As you say Thailand has a conflict next door and they don't seem to be coming out too strongly against that either. Min Aung Hlaing's children are apparently moving money to Thailand and buying assets here. I don't know if that's been investigated yet or not. A lot of the Russians who come here are probably the ones who don't support the war, or at least not so much they want to take part.
Not directly connected but I was reading that supporters of monks in Myanmar have been boasting that their monks and abbots have bigger, more expensive cars than the Thai ones. Surpassing the corruption in Thailand that's been in the news here recently. Of course it's only those monks and abbots in Myanmar that support the military killing that are benefitting.
Ukraine or Myanmar, it's all down to what it will cost Thailand rather than the sort of empathy I would have expected from a largely Buddhist nation. Until I got here and witnessed it in action of course.
What could Thailand do? Say it's wrong to invade another country and steal their children, maybe.