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To this day Russia has been invaded in winter times only by Mongols. Mongols used frozen lakes and rivers for their advantage.
December 1237 to May 1238, the army led by Batu Khan literally wipes out half of Russian cities. It starts in Ryazan then Kolomna, Moscow, Vladimir, Yaroslav, Tver etc track of blood and ashes.
The 6 months of Batu made Russia a vassal state for next 200 years, until Timur destroys the Horde. In fact some historians say the reason Belarus and Ukraine became separate nation was due to that different evolution of Russia.
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