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In Yuri's Revenge, they went back in time to stop Yuri from mind controlling the world, convincing the Soviets to ally with them to take down Yuri together as a joint coalition. Premier Romanov was captured by Tanya and Allied GIs and locked up in prison.
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After a hard fought war against the Premier, the USA took back its territory controlled by the Soviets and also dealt a considerable blow to Romanov's forces, including preventing an attack on Einstein's lab in the Black Forest and using his Chronosphere to invade Moscow directly. When word from NORAD and the Pentagon comes that Romanov's forces are invading the USA from both coasts and the Mexican border now that Mexico was a part of the WSA, President Dugan orders nuclear retaliation, but Yuri sabotages the USA's Allied nuclear arsenal by mind controlling the missileers, causing the nukes to detonate in the still-sealed silos, preventing a nuclear retaliatory second strike. operatives collaborating with Soviet KGB agents, when Romanov initially made it look like the Soviets had turned over a new leaf with forming the World Socialist Alliance and dealing with Mexico themselves so the USA would not have to. This was after satellite intel noticed a large buildup of Soviet forces in Mexico, Soviet warships heading into the Atlantic, and Romanov's chief advisor Yuri having caused a breakdown in relations between the USA and USSR, especially after seeing U.S. The Allies in Red Alert 2 united again due to the Soviets invading America and threatening Europe with nuclear missiles. Afterwards, concerned about the USSR's future should another warmonger like Stalin become Premier, the Allies decided to install a puppet leader in Alexander Romanov, a descendant of the last Tsar of Russia, Nicholas II, who appeared to advocate peace despite being a member of the Communist Party.
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Stalin was killed during the battle from Stavros in revenge for Greece. However, the Allies are able to use Einstein's secret weapon, the Chronosphere to fight back and crush the Red Menace. The Allies was formed in Red Alert 1 due to the Soviets invading Europe, as a result of Albert Einstein using his Chronosphere to go back in time and prevent the rise of Adolf Hitler and the Nazis in Germany, allowing Stalin to lead the Soviet Red Army in a massive invasion of Europe.
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