The AFU only wants combat experienced troops. The only way I'd be able to fight would be via joining a militia, which would run afoul of the foreign fighter laws.

It's like explaining why the sky is blue to a goddamned toddler.

E2A: https://www.perthilj.com/blog/the-legality-of-australians-fighting-in-foreign-conflicts > under s 119.1 of the Act, a person commits an offence if they enter into a foreign country with the intention of engaging in a hostile activity in that country or any other foreign country [14]. A person will also commit an offence if they engage in hostile activities in a foreign country [15]. However, liability under s 119.1 will not apply to an act done by a person “in the course of, and as part of, the person’s service in any capacity in or with ... the armed forces of the government of a foreign country”