Mikhail Kasyanov, who was President Vladimir Putin's first prime minister before joining the Russian opposition, told a media briefing at the European Parliament that Nemtsov was tolerant of all minorities and religions.
Russian investigators have said they were looking into the possibility that the former deputy prime minister was killed over his support for French satirical magazine Charlie Hebdo, which published images of the Prophet Mohammed and was attacked by jihadists in January.
"He never made any statements against the Muslim religion," Kayanov said during a visit to the French city of Strasbourg, where he met leading members of parliament.
Yet, he said, Russsian investigators now "developed the notion that Mr. Nemtsov was killed as a result of anti-Muslim, anti-religion statements."
Kasyanov, who co-led the liberal opposition RPR-Parnas party with Nemtsov, said investigators already had to abandon earlier theories that foreign or Ukrainian secret services were behind the murder.
The Russian investigators' theory of a Muslim link appeared to gain ground after a suspect from Russia's Muslim North Caucasus region of Chechnya -- which held a massive rally against Charlie Hebdo in January -- was said to have confessed to his involvement in the assassination.
They, along with three other suspects, were remanded in custody.
French jihadist gunmen killed 12 people in the Paris offices of Charlie Hebdo in January.
Another friend and ally of Nemtsov, Ilya Yashin, told AFP that the Islamist motive theory for the Russian politician's murder was "absurd" and politically motivated.
Kasyanov said it was "clearly possible to have this (Nemtsov) murder" after Putin created a "hostile environment" by calling for the elimination of a "fifth column and national betrayers."
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
