In February 1945 Franklin Roosevelt, Winston Churchill and Joseph Stalin met in Crimea, the so-called Yalta Conference, to discuss the restructuring of post-war Europe, with the goal of not only discussing collective security, but also the reintegration of liberated states into Europe and their right to self-determination.

The Allies liberated France and Belgium and are currently at war with the Germans on the western front, while the Soviets drove the Nazis away from Poland, Romania and Bulgaria on another front. The outcome of the war is clear, and the focus now is on rebuilding peace. The three heads of state had a private agenda, and Roosevelt asked the Soviet Union to join the United Nations to support the upcoming war with Japan. Churchill demanded democratic governments and free elections in all countries of Eastern and Central Europe, especially Poland and Stalin, pushing the political sphere of influence in Eastern and Central Europe, claiming that it was a national security issue for the Soviet Union.
Russians are also very interested in Poland. The Soviets were interested in establishing a strong free and independent Poland, but the Soviets would still retain the territories they had annexed from eastern Poland in 1939 in exchange for the territories that Poland would acquire to expand westward. Despite the sacrifice of germany, the Polish Provisional Government and the country's Red Army promised them free elections. However, even after the agreement was signed on paper, the Soviet Union was more interested in creating a puppet state and did not abandon their sphere of influence as promised.
Churchill was wary of communism spreading to Europe and the British Isles and wrote to his foreign secretary saying "terrible things have happened." A wave of Russian domination is sweeping across Europe. In order to have an early showdown with Russia and resolve the issue, we must now shift our position. ”
The British prime minister summoned his chief of staff, Churchill wanted assurances that the Allies could fight the Red Army, and asked if it was possible for them to expel the Russians, and Churchill also demanded that the world congress be taken into account when making plans. The start date of the offensive was then set, which would take place on 1 July 1945, but Sir Alan Brooke, a General of the Army, disapproved of it, and he likened the British Prime Minister to a war peddler. Churchill expressed his desire for another war in his diary, while U.S. General George Patton appeared to agree with the British prime minister, who allegedly had advised Deputy Secretary of War Robert Patterson to keep U.S. troops in Europe and border the Soviet Union. If the Russians did not withdraw, he advocated returning them in the name of Eastern European freedom. Patton claimed that we were not here to gain jurisdiction over the people or their country, that we were here to give them the right to self-government. But politicians in Washington and American soldiers still in the European theater were exhausted, hoping only that everyone would be able to go home after such an unfathomable war, and the Pacific still needed troops to invade Japan, Ben Churchill became highly worried about the Allied retreat.
In May 1945, joint planners of the British Armed Forces proposed a plan called "Operation Incredible", the first of which called for a surprise attack on the Soviets stationed in Germany, and the assessment concluded that british and American morale was still high, the Allies relied on the support of Polish and German troops, and the main goal was to impose on Russia by citing the will of the United States and the British Empire. The allies struggled to strike a fair deal with Poland, which joint planners believe could force Russia to comply with allied terms. This may not be the case, and the report notes that the Russians can decide whether they want to go all-out war or not, and they have the ability to do it all-out war, which is unthinkable.
The British prime minister felt good about himself because he knew that the United States was getting a successful result from the Manhattan Project, and if Stalin did not follow the plan, a nuclear attack on Stalingrad or Kiev in Moscow was imminent. The plan called for a surprise attack on Dresden with 47 Allied divisions, which accounted for almost half of the divisions available to Britain, the United States and Canada. But the Committee of Chiefs of Staff did not consider this idea feasible, because even if the entire American British and Polish army were in Europe and the Middle East, the superiority of Soviet ground forces in Europe and the Middle East would still be two to one. In addition to the repurposed German prisoners of war, success depended on raid factors, and it was also believed that the Soviet Union could also ally with Japan because the Pacific War was not over. The offensive operation was therefore considered too risky, Stalin realized Britain's intentions through his spy network in London, and it was clear that the offensive was being carried out.
In June 1945, Marshal Bernard Montgomery was ordered to store seized German arms offers for future use. The senior Commander of the Soviet Union, Zhukov, suddenly ordered the regrouping of Soviet troops in Poland to occupy defensive positions, and Moscow was probably aware of the operation, but it could also have been if the Soviets did not trust the Western Allies and remained vigilant, if the Soviets knew the plans of the Allies, then there would be no chance of a surprise attack.
The incredible operation had too many shortcomings, and the report warned that if we were to start fighting the Soviet Union, we must commit ourselves to preparing for the long and all-round cost of this war. Churchill received a draft in early June and realized that support from U.S. forces was essential, before concluding that the operation was purely hypothetical. Churchill asked for a follow-up report on measures to ensure the safety of the British Isles in the event of war with the Soviet Union. A defensive response was then prepared, but the report concluded that the war was not good for Britain given america's primary focus on the Pacific theater. Although Britain's navy and air force were superior to those of the Soviet Union, there were fears that they would retaliate with the consequences of a massive rocket attack, and Tricho was right to distrust Churchill, and the whole operation was buried forever after his defeat in the 1945 election.
However, fears of Soviet expansion prompted the U.S. military authorities to revise their initial ideas only a year later, and growing tensions between European allies and the Soviet Union forced senior U.S. leaders to reconsider whether "operation incredible" was a viable strategy. But doing so could still trigger a wider conflict, which was officially revived on August 30, 1946, with General Eisenhower advocating a retreat to the Low Countries because their proximity to British territories was considered the first contingency plan of the Cold War, and the plot was so secretive that it wasn't fully made public until 1998.