Mains supply in Russia: 230 V, 50 Hz, sockets of Types C and F. At 230 V the supply matches what UK and European appliances expect, so no converter is needed.
Handy for multi-stop trips: Kyrgyzstan, Azerbaijan, Indonesia and Lebanon use the same plug types. Travelling further to Saudi Arabia, Hong Kong and Brunei means a different adapter. 17 of the 50 destinations in Asia share the plug types of Russia.
Protective earth
Grounded and ungrounded sockets may occur
Earthed sockets (Type F) and unearthed ones (Type C) exist side by side. For metal-bodied appliances the protective-earth path is what matters.