The FTSE 100 looks set to welcome Russian firms for the first time in the face of calls for the firm to toughen up the entry requirements to Britain’s premier stock index. Investors have recently raised concerns that it is too easy for companies with low free floats and hazy corporate governance standards to enter the index, and this has prompted FTSE to look at tightening its future requirements. Recently-listed Russian steelmaker Evraz and precious metals miner Polymetal International, together with Irish building materials group CRH, are expected to join the internationally focused index.