Mr. Navalny’s wife posted a picture of the detention on his Twitter account with the caption “Happy Russia Day!” — referring to the national holiday on Monday. In addition, workers at his headquarters reported that their electricity and internet connection, used to transmit updates from around the country, had been severed. Organizers in more than 200 cities across Russia had filed requests to hold demonstrations in what could be the largest antigovernment outpouring in years. Protests unfolded in numerous cities as the sun moved westward, even in some where they had been banned outright. The authorities had told organizers that anything later in the day would interfere with a major soccer match.

Source: New York Times June 12, 2017 11:07 UTC