moscow defense modifier maybe too light?

[Journier]

moscow has a 1.3x defense modifier in clear plains terrain. Does anyone else get the sense of moscow not really holding up to a great fight like stalingrad/leningrad/ sevastopol? Those cities are around 2.2 -- 2.9x (sevastopol) defense modifier and become the little cities that could hold for a while.

[AlvaroSousa]

If Moscow feels too easy the solution is to find a river line near there.

It isn't easy to get too. There are quite a few forests and some river lines.