At the time of Ramayana,Russia was a part of Bharata Varsha and Kaikeyi of Ramayana who is the Mother of Bharatha and step mother of Lord Rama was boron in Russia
Sanskrit is the source of Russia,Lake Baikal was Indra’s Vaikanasa Theertha.
@DEVENDRACHATUR1

Lahore was the kingdom of Lava, son of Rama
Peshawar was the kingdom of Pushkalavathy ruled by Pushkala, son of Bharatha.
These two cities were established during the reign of Rama
These cities are in the route to Kekaya, today’s Kazaksthan which was the maternal land of Kaikeyi

mother of Bhratha. One has to cross riverChakshus to reach Kekaya. This river is now known as Oxus .

Lord Krishna’s son, Pradhyumna founded a city Port Baijin, Russis,
The Vedas were called Santi Veda,River Moksha is found in Russia
Narada Mountain called as Narodnya Mountain is found in the Urals

“A Pastoral Scene” from the 2nd century AD and is on display at the museum in Corinth(Greece). Obviously this is Lord Krishna the incarnation of Lord Vishnu in his boyhood.

The bare body, horizontal flute, cross-legged stance, standing under a tree with a few cows grazing around is exactly how Krishna is depicted in Hindu pictures.

This painting is of a Roman superior, who is seen wearing the Hindu dhoti, chappals (sandals) and Hindu (Vaishnav) tilak marks on his neck and forehead, reminding one of the times when Europe practiced Vedic dharma and Hinduism.

Three Hindu gods worshipped around Russia. The one at the left is (in below pic) known as Ayu Devata (God of life) is still invoked in Siberia if some near and dear one falls seriously ill.

Other two are just samples of the many gods and goddesses sold in the bazar of Ulan Bator, the capital of Mongolia. These indicate how Hinduism prevailed in the ancient world.
Even the Slav people Balkans, Central Asia and North Asia.