Sorry to burst some bubbles here
I vote the WAllies would make mincemeat of the Red Air Force after six weeks and a pasting of the Baku oil complex b/c Soviet avgas refinery capacity was next to non-existent in 1945. Without fuel planes are pretty heavily-armed lawn ornaments. The Soviets were totally dependent on Lend-Lease for avgas and aluminum. Trying to set it off with the quartermaster of your war machine who can reach out and touch 80% of your country is suicidal. Stalin knew this!
Don't get me wrong, WAllied losses would be horrendous (10K+) planes lost and 200-250K troops casualties until they accomplished that, and would still lose a lot of fighters to AAA in the pushback campaign, but then the strategic initiative passes to the West.
Soviet Army forces wither on the vine without fuel, ammo resupply, or reinforcements, and get cut to ribbons in leapfrogging encirclement campaigns (Bagration in reverse)with an Inchon-landing say in Gdansk. Stalin's brains decorate a wall for needlessly risking the Rodina. The war ends after a negotiated Soviet surrender as WAllied forces push up to the Vistula w/o needing mushroom clouds to bloom over any Soviet cities twelve to fifteen weeks later.
This isn't to say the Soviets couldn't or wouldn't fight well, they just had severe logistical weaknesses Stalin and his crew were richly aware of and tried to make as much progress on the ground as possible so they could occupy wherever their flag flew when the Nazis surrendered, then bluff and bluster as much as possible at Potsdam for more.
The Soviet leadership counted on sympathy and war-weariness from the West and weren't far off the mark. They knew they were a corpse in armour at the bitter end of their rope in manpower and materiel that could pull off one last victory and stand pat from there if they had any sense, which to their credit, they did.
When the WAllies snarled loud enough, the Sovs backed off in Austria and Czechoslovakia. They knew they had a shit hand and figured they could regain whatever ground politically later which they did with the rigged plebiscites in 1948 in Poland, CS, and elsewhere.
IMNSHO, any Soviet offensive in 1945 or 1946 was ASB for the above reasons. We love big battles with badass armies, but politically, there was little point in doing so. The Sovs wanted a buffer zone in Eastern Europe and got it. The US, UK, and other nations wanted to make sure Germany was de-nazified and get 95% of the troops home. Mission Accomplished.
It took a few years before the Cold War solidified into policy as the mutual distrust and ideological power struggle began in earnest.
In AH, it's tempting to fast-forward to the 1960's where the Soviets weren't so far behind the eight-ball economically,and had their ducks in a row to roll NATO back to the Rhine in a strictly conventional tussle, but on 1945, they were in no shape to do so.