On the eve of World War II, the outbreak of World War II was followed by the raid on Poland by 1.5 million German troops. The Soviet Union, which bordered Poland, also took advantage of the situation to launch an offensive against Poland. Caught between one after the other, Poland was soon overwhelmed. Thus the land of Poland was divided. What is puzzling is that the Soviet and German armies defeated Poland at the same time, but the Anglo-French coalition forces after that only declared war on Germany. Nothing was done against the Soviets. What's going on here?
First of all, although the Soviet and German armies were partners, this matter was indeed provoked by Germany. The war had already begun on 1 September, and then Britain and France declared war on Germany and demanded its withdrawal. But Germany turned a blind eye and fought a protracted war with Britain and France. The Soviet Union only joined the fighting on 17 September, and with the defeat of Poland, the declaration of war between Britain and France was meaningless. A Germany, Britain and France, were difficult to conquer, let alone the entry of the Soviet Union.
The declaration of war was just a procedure for Britain and France. Although the British had ideas in this regard, the German Blitzkrieg was rapid. The British were forced to dispel this idea. Second, the Soviet Union did not enter the war without reason, mainly because it wanted to regain the land that Poland had been given in World War I. In 1918, in order to annihilate the Soviet regime, the United States, Britain and France began to interfere in its internal affairs. Poland took the opportunity to invade and occupy the Soviet Union. With the help of the great powers, large tracts of land were obtained. Although the two sides signed the Riga Peace Treaty after the war, it was Poland that acquired lands in Ukraine and western Belarus. But the Soviet Union was always dissatisfied with the treaty. Germany then invaded Poland, leading to the dissolution of the Polish government.
The Soviets at this time declared that the treaty at that time had no benefit. Send troops to Poland for legitimate reasons. While regaining the lost territory, Poland was swept away, and the Anglo-French coalition could not say anything about it. After all, Poland was at fault, and the Soviet Union's fighting national character has always been retribution. Even if Germany did not act, the Soviet Union would not give up
Moreover, according to the alliance agreement, Britain and France declared war on Germany, and according to the treaty, the enemy of Britain and France could only be implemented if Germany invaded on its own initiative, and legally there was no right to declare war on the Soviet Union. In layman's terms, even the Anglo-French coalition did not want to care about the mess of Poland, and at first only used Poland to make Germany attack eastward to deal with the Soviet Union. They themselves come to reap the benefits of the fishermen. They don't lift a stone and drop it on their feet, but things change. After Germany captured Poland, it attacked Eastern Europe. At the same time, the British and French allied forces who wanted to sit on the mountain and watch the tiger fight were powerless.