Vladimir Putin will likely use the result to claim most Russians back the so-called special military operation in Ukraine, writes the BBC's Steve Rosenberg.
60 other events within 300 km in the 30 days around this event.
This report has no exact coordinates, so it is shown at country level (shaded area).
If you're in the area
Active conflict area. Check your government's travel advisory before any travel to Russia,
and follow your embassy's instructions if you are already there.
If there is violence nearby, shelter in place away from windows until it is safe.
Respect curfews and avoid areas controlled by armed groups.
Register with your embassy and keep travel documents ready to leave.