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I did some research on the landmarks depicted on the postcard and found information on two of them:

The Kremlin is a historic fortified complex located at the heart of Moscow, Russia. Situated on the banks of the Moskva River, it overlooks significant landmarks such as Saint Basil's Cathedral and Red Square to the east, and the Alexander Garden to the west. As the best-known of all kremlins (Russian citadels), it comprises four palaces, four cathedrals, and is surrounded by the Kremlin Wall with its distinctive towers. Today, the complex serves as the official residence of the President of the Russian Federation.

Originally designed to be Moscow's primary marketplace, Red Square has evolved into much more. It has been the setting for numerous public ceremonies, proclamations, and even the coronation of Russia's Tsars in the past. Over time, the square has been developed and expanded, serving as the venue for official ceremonies under various Russian governments throughout its history.

The postcard was sent by Marina, who also mentioned that Russia is currently experiencing freezing temperatures.