This is the best summary I could come up with:

He died two months to the day after staging a brief mutiny against the Russian defense establishment that posed the biggest challenge to President Vladimir Putin’s rule since he rose to power in 1999.

Brazil’s Center for Research and Prevention of Aeronautical Accidents (CENIPA), in the interests of improving aviation safety, had said it would join a Russian-led investigation if it were invited and the probe held under international rules.

Russia’s aviation authority was not obligated to say yes to CENIPA, but some former investigators said it should, as the U.S. and other Western governments suspect the Kremlin of being behind the Aug. 23 crash of the Embraer Legacy 600, which has a good safety record.

“They are not obliged, only recommended to do that,” CENIPA head Air Brigadier Marcelo Moreno told Reuters after the agency sent an email last week asking Russia whether it would open such a probe.

CENIPA said in an emailed statement it got the response from the Interstate Aviation Committee - Commission on Accident Investigation (IAC) on Tuesday, with the Russian authority saying it would not open for now a probe under Annex 13.

CENIPA and manufacturer Embraer want to prevent future accidents but face challenges in getting information from the investigation due to sanctions on Russia and Moscow’s reluctance to allow outside scrutiny.

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