This was *not* a thermonuclear bomb.

Besieged Ukrainians tuned into MacGyvers. They scavanged a hydrogen fuel tank from a Toyota Mirai hydrogen fuel cell electric vehicle. They rigged it to explode. And they delivered it to the Russian strong point by using a pizza delivery robot.

https://jalopnik.com/ukrainian-forces-built-a-hydrogen-bomb-out-of-a-toyota-1851620854