The perseverance of the Russian People during the siege of Leningrad was definitely valiant.
In fact, the entire performance of the people of the USSR in World War II was valiant.
It is also true that the Soviets could not have defeated the Nazis without the shipment of enormous quantities of ordinance from the USA to the USSR. This ordinance--in fact the enormous ordinance produced by the USA, essential to winning the war--was entirely the result of the American Free Market--i.e. capitalism--and the freedoms whose protection is guaranteed in the U.S. Constitution.
US wealth--produced by the Free Market--won World War I, World War II, and the Cold War.
A friend who immigrated to the USA from Iran (a Christian, by the way) told me that during World War II he watched endless convoys passing through Iran from America headed for the USSR. He marveled as the enormity of it all. Everyone who witnessed these caravans was astonished--astonished at the wealth of a nation that could ship so much to the USSR--wealth produced by freedom, for the Free Market--i.e. capitalism--is, in fact, freedom. It was then that he began to dream of coming to America.
And Stalin treated them like crap. I already mentioned what he did to the leadership of Leningrad after the war, then there was Operation Keelhaul, and the fate of former Soviet POWs, and then there were the Red Army soldiers whom after the War, saw too much of the West.
I concede to you the valiant efforts and the valiant battles fought by the Soviet army and citizens of the USSR. My comments were meant to address Joseph Stalin specifically and his initial duplicity with hitler