Russia’s top mobile phone operator MTS said on Friday it had filed a lawsuit against Turkmenistan after company’s subsidiary was cut off from the country’s network in 2017.

In September MTS, part of the Sistema conglomerate, said state-owned telecommunication company Turkmentelekom had stopped providing it with its international and long-distance zonal communication services and Internet access.

After that the Russian company suspended services in the Central Asian republic.

The company said on Friday it had filed a lawsuit at the International Center for Settlement of Investment Disputes — an international arbitration institution funded by the World Bank. MTS estimated the loss caused by Turkmenistan’s decision at at least 0 million.

MTS had 1.7 million subscribers in Turkmenistan at the end of June, and the unit contributed just over 1 percent of the group’s total revenue.