To me successful Stalingrad capture also means a successful defense of the ensuing Soviet offensive in winter 1942.
It would be bad for Turkey to join axis as long as the British own the Med. By this point the British are in firm control of Egypt as they win at second El Alamein and the Americans land in the west with Torch.
The 9th Army in Palestine should be enough to hold off Turkey.
In the Pac, US goes through with Guadalcanal after Midway.
Ultimately, the allies are victorious and the East/West line is shifted to the East some.
1943
The Allies mop up N Africa in '43, the Germans might even conduct a better fighting withdrawl and evacuation of Tunisia
After Tunisia, the allies would have the option of Sicily or Cyprus (Cyprus to prepare for Anatolia landings), Allies opt for Sicily since it is right there while building up in Iraq and Palestine. US infantry divisions that are in the Pacific or tagged for the Pac might be rerouted to the Middle East for this. So that would mean that Operation Cartwheel would be limited to US Marine activity. So US Marines have choice of Cartwheel or Tarawa. Nimitz chooses Tarawa. Cartwheel is not 100% cancelled, just scaled back to placing air fields in range of Rabaul and advancing more slowly in New Guinea. One of the main efforts in the Pacific in 1943 is attacking Japanese supply routes.
The big question would be what would the Germans, do they go South to complete Baku capture, center to Moscow or clear up the North in Leningrad. They choose South and North and capture Baku and Leningrad. Soviets spike oil fields in Baku and Allied bombers operating from Persian gulf region ensure that they remain closed off.
Soviets '43 - build up defensive forces in center. Moscow is secure and protected. Stalin is in it for the long haul. Allied supplies are shipped through Iran and central Asia.
Aid to the Chinese may be less than OTL. The Ledo road may be delayed for logistic improvements in Iran and Central Asia. So China gets a little less supplies as supplies are diverted to Russia and Middle East build up.
Allies conduct Operation Husky to liberate Sicily followed up by both landings on Italy and Cyprus. Italy is scaled back some with objective of getting toe hold in Southern Italy. Cyprus is wrapped up early 1944.
1944
Germans go for all out, knock out offensive against Moscow - Soviets hold
Allies land all along Turkey, free up Dardanelles this is in conjunction with advances from Iraq and Syria. Turkey folds and switches sides.
Latter part of 1944, allies land in Crimea
Italy is a slog it out affair in southern Italy, allies move up peninsula some
Pac - Allies land in Saipan, Guam, Tinian, and Rota - secure major naval victory in battle of Philipine Sea (Marianas Turkey shoot)
1945
Russians recapture Caucus area as Allies make advances in Ukraine, Germans forces trapped between two. American supplies flow into Ukraine after Odessa is taken as well.
Allies also land in Dalmatian coast.
In Pac - US Marines capture Iwo Jima and Marcus islands. Japan is being bombed by B-29's from Marianas backed up by P-51's from Iwo.
Nukes still drop on Japan, four cities are obliterated in 1945
Chinese build up for offensive
1946
Germans on defensive as Russians retake all previous Soviet ground while Allies take Eastern Europe, land further up the Italian peninsula and in southern France. Some nukes are dropped in Germany
Italy is knocked out as central Italy is in Allied control. Northern Italy is holding out as German puppet.
In Pac - US Marines land on Okinawa to further isolate Japan.
China is on offensive and makes gains in southern, central, and eastern China
1947
Germany and Japan fold as landings occur in Northern France as allies advance from southern France, Italy and Eastern Europe (combined Soviet-American offensive)
In Pac - US marines land in Korea as Chinese and Soviet forces take Manchuria
In peace,
Soviets control 1940 line in Poland and Baltics, are given East Prussia (OTL Kaliningrad area) and that is it. Ukraine is given back to Soviets.
Soviets have Berlin occupation zone surrounded by Allied Germany
Friendly allied governments are placed in
Poland, borders are set as OTL
Czechoslovakia
Bulgaria
Romania
Hungary
Yugoslavia
and eventually Germany
In Pac - there is one Korea with a western friendly government
Chinese Nationalists are in way better position to finally defeat the Chinese communists in 1949
Philipines granted immediate independence after war, maintain awesome relationship with USA
WWII is bloodier but the Cold War is way less severe
Russians and especially Ukrainians are grateful for direct American assistance. A monument is constructed near Kiev for the heroes of the Red and American armies. Cold war tensions are lighter as American aid is sent after war to help rebuild Soviet Union.
France is a little put back as they did not like being lower on the list to liberate but do not see as much collateral damage as OTL.
Question as to British and French colonialism in Africa and Asia - For sure India and Pakistan see independence. Perhaps with less threat of Communism and the Communist Chinese and Soviet threat, a unoted, independent Vietnam emerges under Ho Chi Mihn