Two things can be true at the same time - we don't want Russia to absorb Ukraine and then further threaten the eastern border of the EU, and we don't want Ukraine to be corrupt.

And in the Ukraine we see that the corruption is uncovered punished, even if it is in the direct circles of the president.

There are problems in uncovering it, but the attempt to get rid of corruption is a big factor in the whole situation and one of the things Russia fears.

For Russia a corrupt system was a lot simpler to influence and Ukraine showing how a partially Russian speaking country, where people moved back and forth, fighting corruption was a threat to the system.