I have an exercise for you:

One country illegally occupies quarter of another country in 2014 and launches full blown invasion in 2022.

Question: how many truths are there?

It depends on your ideology. If you believe in international law, sovereignty and self-determination of peoples, as I do, you will have a different truth than if you believe in dominionism, might makes right, panslavism and historical revisionism as the majority of the Russian population does.

That's exactly my point, your truth is a reflection of your world view and your ideology.

It is silly to assume one's truth as universal and doing so kills all nuance.

Philosophical ramblings are irrelevant when it comes to international law.

International law is irrelevant when it comes to people's perception of truth.

So the only truth is people's perception of truth?

Yes. As humans are inherently ideological and subjective beings, that is all we will ever have.

So killing you is not an inherently immoral act and should be justified under someone's ideological standpoint?

The morality of killing, as everything else, is a question of ideology.

See https://en.wikipedia.org/wiki/Soldiers_are_murderers for a famous debate on this subject.

So the answer is yes.

Correct. There is no objectivity.