Hema, Markland, the SCA, Dagorhir, Darkon to name a few examples, and most of them have been around for more than forty years (although admittedly, Dagorhir and Darkon mutated more into ‘combat larping’ than live steel.)
I started that when I was 12 years old, more than 40 years ago, the SCA was started in Berkley in 1966, although they did shift to Rattan Weapons from live steel in ’72’.

https://www.sca.org/about/

Sorry, batshit Russians didn’t invent it, nerdy hippies invented it, and even THEY owed the idea to games like “Killer” and, of course, the live-steel traditions of various Military academies across both the Americas and Europe.

Not to mention Kendo.
But I am very glad you enjoy it, I have been fighting in armor for over 40 years myself 🙂

Did you know that the SCA is on the FBI watchlist as the “largest private military on Earth?”. Basically, every single combatant requires heavy training in both melee weapon combat AND combat safety.