I once read, that russian forces where preparing to help the polish at warshaw..When they recieved word of the soviet high command that they will not attack and let the germans handle it. Many soldiers where shocked to hear this and several deserted their post in a futile attempt to try and help...All get excecuted
Well, that was the initial plan, to hold the city in control for few days and let russians in, so it could be said that Polish, not Soviet army liberated Warsaw. They hold it for over 60 (!) days and soviets never came...
We can assume that it was known to Home Army generals that for Stalin a good polish underground soldier is a dead one, but you know once the big machine is started it is not so easy to stop it. At August 1st people were happy, happy that they finally can take up open fight vs Germans.
Soviet army stayed at right bank of Vistula, Soviet airforce hadn't been allowed to fly over Warsaw, west-allied request to have bombers with support for uprisers land in Russia was denied (they flew anyway, just longer route and much lower quantity than they could with landing fields on the east) and the city was burning...