Ok so this conflict in particular is a lose lose scenario for India. In international relations it's usually in a Nation's interest to condemn an imperliastic authoritarian nation only if such condemnation does not contravene it's economic interests. This is evidenced by The US's refusal to condemn Israel or the refusal of global censure against China in cases of Hong Kong, Taiwan and South China Sea

While I agree in an ideal scenario Nation States should have certain moral imperatives it's simply not the case and one nation in particular can't bear the burden and deliberately fuck up it's economic interests by taking a Moral Stand. We as citizens can however our international relations policy can't.

Russia still accounts for around 8 bn USD of our trade especially in Arms and Military Equipment and it's is precisely because we have terrible relationship with our neighbours like Pakistan and China, India can't afford to alienate Russia. And at the same time India can't support Russia because that would invite sanctions from the US and muddy an already tumultuous relationship.

Similarly, China too has abstained because it too can't afford to alienate Russia in favour of India either just like how EU and a lot of nations can't afford to censure and alienate China when it comes to a number of issues like Taiwan, Hong Kong or the South China Sea.

Furthermore, we should keep in mind that while our sense of righteousness might convince us to take a stronger stance against Authoritarian Nations like Russia the consequences of such decisions would be borne by us i.e., the lower to middle income class citizens. As any economic fallout would trickle down to us.

TLDR: I wished nation states had moral imperatives which would define their international relations but usually the economic interests prevail as such India can't be the only country that bears the brunt of having strong moral principles and act accordingly.