How do you volunteer to join Ukraine's defense forces? How can veterans help?

Currently, the Ukrainian Territorial Defense Force has an algorithm of how to apply. But I don't know if they are conducting SRP's (Soldier Readiness Processing). I would think the background check, aside from DD214 showing military experience, including a combat zone, and some kind of military resume would be needed. I read the article below, posted by MSG Borders, and have met the Georgian lieutenant colonel mentioned. They have been absorbed into the Ukrainian Armed Forces in 2016. As a result, I would expect a more orderly process.

It is not unheard of. WWI, volunteers fought(many pilots) for the French until the U.S. came into the war. Spanish Civil war, there was an American Bde. Before U.S. entered WWII, pilots flew for the English until U.S. entered, then they came home.
There is an international Bde set up and I know Mercs are headed there. I'm guessing you would be put there. I wouldn't count on pay, if it comes great. Fed, I'm guessing yes but don't expect the best or like the U.S. Really doubt if there is a vetting system, come one, come all. Better have all your ducks in a row before you go. Make sure you check your ego at the boarder, I have served with Americans who'd never been outside the U.S., our way is not the only way. I would take a couple good pair of boots, who knows what you would be issued. Better be familiar with Russian type weapons. Make sure you got money for the ride home. Want to go for it, if you are in the Guard or Reserve, or IRR be careful. Lots of sticky situations there. Want to go, have fun.

If nothing were to stop you, you gave plenty of reasons to not go! The next would be why and the heck go. The USA have needs here at home on our border! The Texicans are there on their own, not provided food, place to sleep, no one knows what to take with them. I got no response what to take with you. Guns no guns no intel!

I give my opinion here as being a veteran in civilian life. I think my profile says that I am still in, but for reasons, I have not been on here in a few years, and the site wont let me input my correct ETS date. I have read the comments above, respect your opinion, and agree with many. I would like to make a second statement.

There is nothing saying that as a veteran in the civilian life, one cannot go and fight for another countries cause. At least I have not found anything yet in my research. Joining the forces of a foreign country is not the same as obtaining citizenship (albeit, I did say "Hell, I might just make a new home in the Ukraine," I did not say it was set in stone, nor that I would obtain citizenship). However, on the comment saying you can't receive your benefits, well, you can. You can live abroad (U.S., Deutschland, Ukraine, Russia, South/Central America, Canada, etc.) and still receive your benefits. See the following reference from the VA website:
https://www.benefits.va.gov/persona/veteran-abroad.asp#:~:text=If%20you're%20a%20Veteran,place%20of%20residence%20or%20nationality.

obviously, if a civilian volunteers is injured, I would assume said injury will not be treated as a service related injury at the VA. But yes, get your ducks in a row, to protect yourself from any legal ramifications, some prosecutors are a little too eager.

I personally believe that the U.S. should provide military aid. Freedom is in perilous state for the Ukraine. We may have no duty or obligation to go into Ukraine, but neither was there for Iraq, Afghanistan, Vietnam. Our Country has a history in getting involved in other countries fights, but now we say no, to a proud people who are begging for help, in fighting a country who are murdering innocent people, women, children. Ukraine cannot hold Russia forever. Russia will not stop at the Ukraine. Laws and Treaties of the U.S. and international laws allows a sovereign country such as the U.S. to punish any person(s) from any country (such as Putin, his generals, etc.) for violating international law, for war crimes, or any crime committed against humanity.

I'm not a war mongrel. I'm trying to make life changes. But I feel that providing a physical presence and assistance (whether as a volunteer or a military presence), defending the Ukraine is the right thing to do. I would do it regardless of financial payment. I would hope they provide food, but I can hunt and fish. I will appeal my request to the Embassy.

Would this war bring us into World War III? I'd say yes. But it must happen. If not today, maybe it will happen in 50 or 100 years from now. We can try to hold it off as long as possible, but WWIII is inevitable.

Thanks all

Not our fight....Risks outweigh the gains.

Stay stateside. Russia and Ukraine are but a spark.

Please search an article about this in army.com? The Constitution, do not allow anyone receiving benefits, to fight for another country. But You can request permission from your Branch of service. Also, if volunteering, not travel expenses, money etc. are allowed. I think it is much better to help from here sending them supplies, food etc.; than going to fight, remember that the modern Russia was born in Ukraine, and this is more than a family dispute going to the extremes, like during the First and Second War.