Hi, the current handling operators available in Russia in GSX are Aeroflot and Transaero. But Transaero has been defunct for almost 5 years now, so I think it'd be better to replace it with what many call Transaero's successor: Rossiya. Below is an image of a Rossiya pushback tug at Pulkovo Airport.
https://i.imgur.com/w5xXTu9.jpgAlso the Rossiya logo could be in English as well.