A city where the weather has historically been a major force preventing invasion does not bode well for agriculture!Oh my God, you are wrong on the INTERNET! I must attempt to help you!
There's PLENTY of agriculture on the same latitude as Moscow, in fact there's plenty of agriculture in and around Moscow. There's no oranges or bananas but wheat and potatoes do just fine in the surprisingly long and hot summers. Just because the winter is also long and bitterly cold, does not automatically imply summer must be short and cold.
Climates are not that simple.
