The reason is simple, because in the eyes of Stalin, who was in fact a nationalist, he was the hero of the other, the enemy of mine.
In the perception that many people take for granted, the enemy of the enemy is the friend. However, such a statement is obviously not absolute, and when in a weak position, in the face of a common strong enemy, the enemy of the enemy naturally becomes a friend who can warm each other. However, when in the ascendancy, the enemy of the enemy may not become a friend, but is likely to be an enemy. After the Warsaw Uprising, the Soviet Union faced such a situation.
Stalin
After experiencing the tragic Soviet-German war in the Soviet Union, the Soviet Union, which finally gritted its teeth and persevered to the end, became the victor of this war. In 1944, after recovering most of the fallen territory, and launching a major counteroffensive and advancing the front into Poland, it was only a matter of time before the Soviet Union, which was getting stronger and stronger, won the final victory in the war against Germany.
On January 2, 1944, the Soviet Second Belorussian Front marched into Poland and began to rapidly capture a large area of Polish territory occupied by Germany. On July 21 of the same year, in lublin, a major town in southeastern Poland, which had been occupied by the Soviet Red Army, a Polish National Liberation Committee composed of the Polish Communist Party, the People's Party, the Democratic Party, the Socialist Party and other parties was established and issued a declaration.
At the beginning of World War II, Germany and the Soviet Union partitioned Poland
The Polish National Liberation Committee claimed to be the legitimate government of Poland, and naturally the Polish government-in-exile, which had fled Poland after being blitzkrieg by Germany and eventually into exile in London, England, was declared illegal. Obviously, the Attitude of the Polish Government, which was supported by the Soviet Union, was inclined to the Soviet Union.
However, such a Polish government was clearly not in the interests of the Western countries, much less in the interests of the Polish government-in-exile in London. From the moment of its founding, the Attitude of the Polish Government-in-Exile towards the Soviet Union was extremely hostile.
Relations between Russia and Poland are complex, and for the most part, Poland has been the subject of bullying. Even at the beginning of the outbreak of World War II, the reason why Poland was destroyed, in addition to the German blitzkrieg, the Soviet Union jointly sent troops to divide Poland, which was also one of the key reasons for the rapid demise of Poland.
USSR
Thus, the Polish government-in-exile had reasons to be hostile to the Soviet government, both for historical reasons and for the demise of the Polish government. With the successive defeats of Germany and the imminent clarity of victory in World War II, the Western countries led by Britain and the United States gradually showed their incompatibility with the Soviet Union. This attitude of the Polish government-in-exile naturally received the acquiescence and support of Britain, the United States, and other countries.
However, although Britain and France were strong, they were very far from the Polish mainland, and their influence on the Polish mainland was even less, but the Soviet government that had entered Poland with a large army counterattacked, and the Lublin Committee that could give him great support, if this situation was allowed to develop, Poland was bound to fall into the hands of the pro-Soviet faction supported by the Soviet Union.
Faced with this situation, the Polish government-in-exile decided to launch an uprising in Warsaw, the capital of Poland, which was responsible for the uprising by the Polish home army in Poland, led by the Polish government-in-exile. In the vision of the Polish government-in-exile, if the home army can occupy the capital before the Soviet Union captures Warsaw, it will inevitably lead to the established fact that the Polish government-in-exile occupies Warsaw, and with the support of Britain and the United States, it will be very easy for the Polish government-in-exile to return to power.
Warsaw Uprising
Naturally, from the moment the insurrection was decided, the Red Army of the Soviet Union, which was not far from Poland, not only failed to become an ally of the Polish rebel army, but on the contrary became the object of their best vigilance. This was illustrated by leaflets issued by the Polish rebels at the time, in which they even had the phrase "The Bolsheviks came to Warsaw and claimed to be friends of the Poles, which was a sinister lie", and after the uprising was launched, the extreme Polish rebels even killed many Poles who participated in the uprising but were considered pro-Soviet. The hostility of the Polish government-in-exile towards the Soviet Union is evident.
However, the wishful Thinking Polish Government-in-Exile apparently greatly underestimated the strength and will to fight of the Germans in Poland at this time. It is even more underestimated to look at the influence of the Soviet Union in Poland. After the uprising was launched, although it was supported by a large number of Poles in Warsaw.
However, the rebel army was very limited in number and the weapons and equipment were extremely poor, and it is said that the Polish army, which numbered between 20,000 and 50,000, had only 1,000 rifles, more than 1,700 pistols and more than 300 homemade submachine guns. Such rudimentary weapons and untrained armies could not be the opponents of a well-equipped, well-trained German army.
When the Warsaw Uprising was suppressed, the Germans did not even use the field troops stationed on the outskirts of the city to prepare for the Soviet attack, but only the armed police and the Waffen-SS in Warsaw, and completely strangled this wishful uprising of the Polish government-in-exile.
Stalin's Soviet Union was not indifferent to this apparent hostility to the Soviet Union, and in fact, after the uprising began, British Prime Minister Winston Churchill and U.S. President Franklin D. Roosevelt repeatedly called Stalin to call on him to support the Warsaw uprising. He also used the air superiority of the American, British, American, and British armies to airdrop a large number of strategic materials in an attempt to support the Polish rebel army.
The Soviet Union did give some assistance, and during the Warsaw Uprising in Poland, the fighting between the Red Army and the German army never stopped, and the Soviet Union lost nearly 500 tanks. But on the whole, Stalin was not cold to the uprising, let alone to active aid, for the simple reasons.
The Red Army
The Polish government-in-exile that led the uprising was itself extremely hostile to the Soviet Union, and at the time of the uprising it openly declared itself the enemy of the Soviet Union, and it was absurd in itself to ask for soviet assistance. Moreover, once the uprising was successful, it meant that the Soviet-supported committee would become very embarrassing, and it would directly affect the future layout of the Soviet Union in Poland. Naturally, Stalin, who had a very strategic vision, would not go to the aid of his opponents and do the stupid thing of lifting a stone and dropping it on his own feet. On the contrary, nipping danger and opponents in the bud is the consistent fierce style of steel comrades.