The IAAF extended the ban on Sunday and also said it was investigating after Reuters reported that banned Russian coaches were still working with athletes.
Russia's athletics federation was suspended in November 2015 after a report commissioned by the World Anti-Doping Agency (WADA) found evidence of widespread doping in the sport.
(Reporting by Maria Kiselyova, Gabrielle Tétrault-Farber; writing by Tom Balmforth; editing by John Stonestreet)
