Probably because they have their own problems and helping George Soros and the Oligarchs loot Ukraine is not high on their priority queue.
I haven’t dug around in the issue enough to try to find the hand of Soros but it does seem to fit the usual globalist pattern. Break up nations into small pieces so they are weakened and then bring them under some kind of international control.
To me it never seemed Organic like the nearly ignored unrest in Venezuela.