What was the cause for the Soviet lack of support for the Warsaw Uprising?

by madmissileer

Soviet forces are often criticized for not supporting the Warsaw uprising in WW2 for political reasons (to eliminate Polish rivals etc.) However I have also read a conflicting viewpoint that states the Red Army was not in a position to cross the Vistula.

So, what is the consensus today among historians? Did the soviets stop short of Warsaw for political or military reasons? And what are the evidence for both sides?

OldWorldGlory

Here's a response from /u/Georgy_K_Zhukov that gives good details about Soviet-Polish relations and the goals of the Soviet Union at the time.