sentences:  Telecom operator Bharti Airtel on 12 December 2017 said that it has signed an agreement with Millicom International Cellular S.A. to acquire 100 per cent stake in its Rwanda operation which operates under the brand name of Tigo Rwanda.Bharti Airtel Limited.has entered into a definitive agreement with Millicom International Cellular S.A. (Millicom) under which Airtel Rwanda Limited will acquire 100 per cent equity interest in Tigo Rwanda Limited.