1944-45. Nazis arm Soviet POWs who are promising to topple Stalin and who then turn around and liberate Prague from the Nazis, only to be turned over to the Soviets after the war ends. Nothing is as simple as it seems.
Vlasov’s forgotten army
Communists buried legacy of Soviet General Andrei Andreyevich Vlasov and his battalion of POWs that helped free Prague from the Nazis
By Stephen Weeks, for The Prague Post
…Between that November  and April of 1945, two divisions of “Vlasov’s Army,” more than 50,000 men, were formed, equipped and trained. Nine officers were Jews, concealed by Vlasov personally. Germany could not afford to equip and provide munitions for more men. This army had its own hospitals, training schools for officers, supply systems and air force. And on April 14, 1945, it was sent not to liberate Russia but to try to halt the Soviet advance across the Oder, only a few hours’ drive from Berlin.
Seeing how hopeless, as well as pointless, the situation was for his force, Vlasov turned his men back and decided to march across Bohemia to get to Pilsen — where he would deliver them as prisoners to the Americans, who were halted there. Stalin had already made it known that if any of Vlasov’s men fell into his hands they would receive long and painful deaths.