When you claim arming a country that has been invaded is “escalation” and note those arming are “imperialists”, you are shilling for the aggressor.
If that's how you read it. It does seem, at the very least, reasonably factual to state that, if a war between two countries starts to involve other outside powers, it would be a fair statement to call that "escalation." If such actions lead to an increase in fighting and casualties (as opposed to decreasing them or calling for a truce), then why is it incorrect to refer to it as "escalation"?
As for the West being "imperialists," that's been an overall criticism of the West long before this. They can be called that for any number of reasons, not because they're arming Ukraine.
Again, none of it actually "excuses" Putin's actions, which is what you suggested. It merely points out that the West's motives here may not be entirely honorable, based on their overall historical track record. Putin's motives don't appear honorable either, but one doesn't really have anything to do with the other.
“Peter the Great waged the great northern war for 21 years. It would seem that he was at war with Sweden, he took something from them. He did not take anything from them, he returned [what was Russia’s],”
That’s pretty straightforward is it not?
That appears to refer to an ancient claim, even going back before Peter. Alexander Nevsky got his name from defeating the Swedes at the Neva River.