Ms Estemirova's body was found a year ago near the Chechen Capital Grozny.

BBC: Killer of Natalia Estemirova 'on wanted list'

In 1990, a Tu-154 aircraft was forced to land in Turkey after taking off from the Chechen capital, Grozny.

BBC: History of hijackings in Chechen conflict

The Kremlin has buried a plan it mooted in December to have Mr Yeltsin make a token visit to Grozny, the Chechen capital.

ECONOMIST: Russia and Chechnya