In 1942 Russia had the two most powerful industrial giants of the world as allies GIVING Russia supplies, tanks, aircraft, food, shoes, uniforms and everything else needed to fight a war for free. Now they are on the opposite side and furnishing Ukraine with all that stuff. Russia is far weaker now than then. At least then it was able to build a nearly world-class tank with mostly supplies (except steel and aluminum) from Russian sources. Today it can't. All the electronic components have to come from countries that Russia has made its enemies by invading Ukraine.