The Conservative government have exactly the right balance of the current situation. We don't want to support Ukraine any less than we currently do and we definitely don't want boots on the ground.
I think the real criticism I have is the extent to which countries look the other way to unacceptable actions in favour of business. I think Capitalism has probably been one of the biggest reasons for peace between major nations in the world and there are obviously positives. But the Conservative government (not the only ones of course) have taken donations from Russian nationals closely associated to Russian politics and Putin. They've made the son of an ex KGB agent and close ally of Putin a lord! Whilst they are taking the correct action at this moment in time, it's almost because the world couldn't keep looking the other way. Taking stronger action against Putin over Crimea or over what the UN have alleged to be war crimes in Syria may have prevented the current situation but it would have been financially inconvenient for us to do so.
We're doing a similar thing in the Middle East as well. Turning our back on Saudi Arabian war crimes in Yemen because action would jeopardise our arms deals with them. In addition to that we have the donations from those with political and business interests. Ken Costa, Bin-Salman's "point man" in the UK has personally funded both the Conservative Party and Jeremy Hunt. Jamie Reuben has donated over £800k to the Conservatives and donated £50k to Boris Johnson personally. Is it any co-incidence that Johnson intervened to allow the takeover of our friends up the road by a consortium comprising of the Saudi Government and the Reuben brothers? Saudi can sports wash their evil deeds, the arms/oil deals can carry on, the Reuben brothers can get even richer and Boris gets some funding... everyone's happy except for the Yemeni citizens.
The Conservatives are not the only culpable party in this kind of behaviour by the way, they're just the current custodians of power and it's misuse. We seem to so often ignore long term consequences in favour of immediate convenience. I'd say that's an issue that affects national infrastructure and assets too, but that's a different topic.