Diplomatic repercussions of further delaying the Second Front?

Exactly what sorts of threats would Stalin have acted on had the WAllies decided on pushing back the opening of the Second Front against his repeated pleas?
 
Probably some hints about another Soviet-German deal get 'leaked' to an allied embassy in Stockholm. In the long run a worse image of the WAllies on the continent, the communists might do better in France and Italy.
 
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