They're not requesting script kiddies, and they're not asking for a bunch of vigilantes. They want applications:
> "Ukrainian cybercommunity! It's time to get involved in the cyber defense of our country," the post read, asking hackers and cybersecurity experts to submit an application via Google docs, listing their specialties, such as malware development, and professional references.
You'd be amazed at how well offensive skills translate to defense. Some of the best blue-teamers are former red-teamers. If you don't have offensive skills, it's very easy to overlook things, especially when it comes to pivoting and exploit chaining.