While Kyivstar employees were at work in Simferopol, unidentified armed individuals entered the office and began installing their own unspecified equipment onto Kyivstar's telecommunications equipment.
Kyivstar responded to the invasion by suspending mobile phone service in Crimea. The company's media office explained that the decision was made out of concern for its employees' safety and security of its subscribers.
Kyivstar reported the incident to the National Commission for Communications Regulation.
Crimea is a region in Ukraine that was annexed in March by Russia in a move that was widely regarded as illegal by the international community.