I believe they need to sell/buy new F35s and to empty garbage somewhere.

I really doubt they have best interest of people in Ukraine in mind. Those people are weapon dealers, that's it.

Once I have lived in a building in which most people were from local arms export company, everyone was depressed or sick.

I guess less slavic people is also nice, like Hitler wanted.

They'll be a nuisance to Russia but nothing the S-300's can't deal with eventually. They're not going to change the outcome of the war, just delay the inevitable negotiated peace.