I've always thought about one thing --US-JCS mentioned assets in Qatar to provide Air support to Afghanistan govt.
B-52s are large moving targets, Iranians or Russians can potentially slip in few short to medium class SAMs to ruin the game. I don’t see Russians doing it tho. Iranians, depends, what post Ghani govt promise them in return.
USSR had a score to settle with US for it's engagement during the USSR-Afghan War to extract blood one would think in last 20 years they'd slip weapons in and made this war costly than it was.
I often feel it's a missed opportunity, had I been the Russian's I would've quietly jumped in.