Vladimir Putin: How he has changed Russia forever
Russians are voting on a series of sweeping changes to the constitution that would mean President Vladimir Putin could stay in office until 2036, making him the longest serving Russian leader.
The reforms would reset Mr Putin's term limits to zero in 2024, allowing him to serve two more six-year terms.
There is no independent scrutiny of the seven-day vote, and copies of the new constitution appeared in bookshops during the week.
Video by Yanita Georgieva