It exists so the regime in the u.s. can basically send a message to the russains: if you invade, we can use the insurgency and fighting to claim the ukrainians are rejecting russian presence, and that the russians are slaughtering ukrainians. Thats the purpose here. Its to hurt them on the international stage, and provide pretext for further u.s. actions against russia. Its basically a trap If I were running russia, I would counter by sponsoring my own paramilitary forces in a neighboring nation next to poland. The u.s. is much easier to bait into losing fights than the russians. And the u.s. has forces in poland. Its basic zone denial.