Easy was a typo… it’s not easy, but if it’s a focus, you can make it happen. And it’s worth it.
Coupled with this strat I like to bulk my German ground units in Romania, put a minor there, and Go for UKRAINE.
My units STOP at Ukraine, and hold a defense - thus to get an advantage over OVERWHELMING Russian forces. Build Mec/Arm in Romania, and 3 inf in UKR, odd artillery maybe. UKR WUK and the territories east of that, are worth some decent coin, the rest of Russia is wasteland.
Then use your Baltic Navy, which has been threatening sea-lion, FORCE YOURSELF to build a few transports (This is painful) and Hammer Leningrad.
The Russians have to defend 2 front at once, and can’t do it, usually, Leningrad gets given up.
This is a slow go though… and you need to be playing a hell of a tactical game, keeping the allies OUT of the mediterranean, by taking, sacking, blocking Gibraltar every possible second.
Also, if your opponent is unsuspecting, from UKR, you’ll have a medium/sizable mobile force. IF the Italians use air power effectively, they can crack open a 1 to 3 man blitz block, and the germans can break through to smash the capital - OCCASSIONALLY. the mistake is your opponents to make.