O1 Properties filed its intention to float on the London Stock Exchange last week, hoping to raise more than £250m.
The firm is incorporated in Cyprus and is one of the largest owners and managers of office properties in Moscow.
RLM Finsbury has been called in to handle UK comms around the listing process, with London-based partner James Bradley and associate partner Anastasia Gorokhova handling the account.
Mikhailov and Partners will support comms throughout the process in Russia.
The listing potentially represents the largest Russian IPO since Buchanan-advised fertiliser group Phosagro raised $538m last year before the new listing market effectively shut in July.