Well, de facto that convention wasn't respected, see Yugoslavia. Also, Ukraine did get something from us even after WW2 [1]
I agree about the unfurling part, I was just trying to point out that the Ukrainian state crying about "the big bad Russian wolf" when that bad wolf is a major reason behind their actual foundation as a State is a bit hypocritical. Even more so when the Ukrainian state expects us, their neighbours, to join in in their battles against the Russians.