This is but one example of a larger systemic issue with media in the 21st century, and an issue with how people consume that media.
Virtually every platform is like this, not just TikTok. It's not like TikTok tries to present itself as a neutral, unbiased source. Their whole premise is delivering "highly curated" content to you as fast as possible. The problem is that people have accepted that as normal and it's doing horrible things to the world. There's a reason everyone feels like we're the most divided we've ever been...and it starts with things like this.
As far as the war in Ukraine is concerned, this is just like classic WW2 propaganda but turned up to 11 due to the nature of how fast and easy it is to spread [mis]information these days.