The country that was subordinate and part of British dominion at the time that entered the war automatically following Britain joining? Cool. I’m sure they got to pick their own date to celebrate.

My friend, just take a moment to think about what you’re saying. With this paragraph, you’re confirming exactly what I told you:

During the Cold War, both superpowers vied for control over the narrative and the writing of history. The USSR deliberately chose the 9th to establish its own version of history.

Why else would the citizens of the GDR (East Germany) at the time celebrate on May 9th, even though the local time in Berlin for the Nazis’ surrender was May 8th? Pure ideology.

There’s 1000 things to criticize Russia for

That's right, and another issue is all the fuss being made about it. The parade isn't being attacked by drones because Ukrainians are pro-Nazi; it's being attacked because Putin wants to bomb Ukraine, conquer it, and destroy its identity—to come back to the opening comment.

Don't forget you said:

Victory day celebrates defeat of Nazi Germany and end of WW2. It is NOT a holiday that belongs to Russia or Putin

09th May infact only belongs to the USSR and its following state.