"In 2023 saying Tiananmen Square massacre never happened is an extraordinary claim" is a conclusion. If you publicly claim that something happened, you should be prepared to provide some kind of evidence, even if it's flimsy. If you're actually willing to learn, read section 3 of this article
the point is that many Europeans are racist against Asian people (among others) and they're "placing" Russia in Asia rather than Europe for this reason
the Tiananmen Square Bicycle Massacre