MONTE CARLO, Monaco — Four Russian track athletes were sanctioned for doping by the federation today, bringing the total to 16 caught for drug violations in recent months.

Race walker Anatoly Kukushkin, steeplechase runner Roman Usov and runner Julia Smirnova received two-year bans, the International Association of Athletics Federations said on its Web site Thursday.

Anton Jarov, a distance runner, tested positive for cannabis at the youth championships in June and received a public warning.

Kukushkin tested positive for the stimulant carphedon at the national championships on June 8.

Usov, who was pulled out of the Beijing Olympics after Russian media reports of a failed doping test, was banned for two years for testing positive for carphedon in July.

Smirnova tested positive for strychnine on March 29.

The IAAF also confirmed the previously announced two-year bans for five Russian race walkers who tested positive for the endurance-boosting hormone EPO: Sergei Morozov, Viktor Burayev, Vladimir Kanaikin, Igor Yerokhin and Alexei Voevodin.

Last month, seven leading Russian women athletes were suspended for two years for tampering with doping samples. Among them were two-time world 1,500-meter champion Tatyana Tomashova, world indoor 1,500-meter champion Yelena Soboleva, former hammer throw world record-holder Gulfia Khanafeyeva and former world 5,000-meter champion Olga Yegorova.