Um no. Leningrad was indeed beseiged, for 2 years. A million dead in that. Stalingrad was not beseiged but assaulted and taken, but almost a year after US entry. Mocsow wasn't beseiged at all, unless you count large battles named after it 50 to 200 miles shy of it. And it was soldiers who bore the brunt in both of those.
The Russians lost 7 million men from the military, and 2 to 3 times that from civilians. But no it wasn't the cold. It was Germans, especially in the occupied areas. Ukraine was systematically starved as agricultural production was forcably taken and used for the occupiers or shipped to Germany.
It is true Russian domestic product fell 40% because so much of the country was occupied, and much of what remained had to go into armaments. That killed off some of the old and frail, because it reduced civilian rations to about 1200 calories a day. Try it, it is an effective diet if you can stick to it, you will lose 3-4 pounds a week. If you aren't overweight you will find it a trifle uncomfortable after a bit. Now try it for 2-4 years.
Just for starters. The article is a silly comparison based on half digested, incomplete history.
These Men's News Daily articles tend to be pretty embarrassing.