Russian politician Mikhail Kasyanov has accused President Vladimir Putin of "silently encouraging" intimidation as a row over a menacing video continues.

The video posted by Chechen President Ramzan Kadyrov, a strong Putin ally, portrayed Mr Kasyanov though a sniper's gun sights.

Mr Kadyrov has criticised social network Instagram for removing it.

Speaking to BBC News, Mr Kasyanov said Mr Putin was responsible for Mr Kadyrov's actions.