The key to a KGF is to eliminate Germany’s ability to get to or partake in a 1-2 attack on Mos. This is best done if you can maintain a massive Allied (all 3 Allies participate) stack in Wrus with UK/US landing through Kar. From here you can send Russia after Japan, while UK/US finish off Germany. This assumes you have the ipc lead. And of course can be easier said then done.
The first thing is don’t over extend with Russia or waste units.
I like to attck Wrus only and bring in overwhelming force, but a case can be made to attack Wrus and Ukr. A 3 inf, 3 arm buy is usually pretty solid. This can establish a solid base in Wrus and prevent Germany from stacking Ukr or Kar on G1. It also gives the UK/US time to land in Afr and set up their Atlantic fleets. On the Eastern front I’ll fall back. Maybe keep an early Yak stack, but retreat before Japan can attack.
Likewise I’ll retreat any US inf and get my bomber to Mos/Cauc ASAP. This allows the US two turns of attacking the forward J inf. 1 inf, 1 bom in 1 rd and 1 inf, 1 bom in another.
I also like to retreat the UK inf in Trj/Per/Ind before they can be attacked and again once you get your UK ftrs to Wrus (UK 1) and bom to Mos or Yak you can chip away at advancing J inf or even hit Ukr if you moved 1 inf to Cauc.
If you can land in Alg in Rd 1, then great, but if you have to do it on rd 2 that is fine. you can usually hit with 4 UK units and 4-6 US in Rd 2.
The benefit of the slightly heavier landings in rd 2 is it may scare the Germany player to slightly over protect WE or even SE and that means less units for Russia. Your goal is to lenghten the game (typically the longer the game the better it is for the Allies), so you don’t need any foolish attacks or gambles, you are just playing the numbers. And If Russia holds Wrus when UK/US start landing in Kar (~rd 5) then I’d be willing to guess that the window on the German threat to Mos has closed and now you can shuffle troops to Mos if needed against Japan or press on Belo then EE and completely shut Germany down.
I consider WE an afterthought for the Allies. It is nice to have but it keeps UK/US troops away from Russia. If you can trade it then great but you shouldn’t try to hold if those units would be more valuable in defending Wrus/Mos/Cauc.