Heartwarming: the worst people you know are all fighting!
I hope they shred each other.
Yeah, I wish :/ Unfortunately, our international institutions (and even some world leaders) are still refusing to hold Russia accountable for mining and destroying the Kakhovka dam. Russian mining in Ukraine is extremely bad; I honestly fear it's going to be as bad as what the Khmer Rouge did to Cambodia.
Something neat that I've been reading about, though, is that Cambodians are helping Ukrainians with the de-mining by training more mine-sniffing rats. It's been pretty successful in Cambodia because the rats are small enough that they can detect the mines without setting them off.
I don't remember hearing anything about the Brits training Ukrainian pilots (would be really cool if they are, though!), but I've heard multiple times that the French are training them on the Mirage 2000.
If you're referring to Sign My Rocket, it's legit. I've been in the guy's Telegram channel, Combat Footage; the pinned messages have more information, including when the actual website was launched (iirc, it all used to be done via Telegram messages). I believe the older pins explain how he's working with a charity helping the army in Cherkasy. A friend of mine recently bought a signed shell as a birthday gift to himself. Most people will go for the shells since they're smaller and cheaper.
Obvious content warning for the channel itself - as the name says, there's tons of footage from the battlefield that is posted.