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According to Timatic transiting without a visa is possible for passengers with a confirmed onward ticket for a flight to a third country within 24 hours. They must stay in the international transit area of the airport and have documents required for the next destination.
TWOV does not apply to passengers departing to Sevastopol (UKS) or Simferopol (SIP).
TWOV does not apply at Irkutsk (IKT), Kaliningrad (KGD), Khabarovsk (KHV), Krasnodar (KRR), Mineralnye Vody (MRV), Rostov-on-Don (ROV), Sochi (AER), Yuzhno Sakhalinsk (UUS) and Zhukovsky (ZIA).
https://www.timaticweb2.com/integration/external.php?ref=d975cfc59f5c0abd06d16e872198110b