Cycling's global governing body the UCI on Thursday announced that Russian rider Valery Kaykov had been suspended provisionally after failing an out-of-competition doping test. The UCI said that it acted after a lab in the German city of Cologne, accredited by the World Anti-Doping Agency, found that an A-sample of Kaykov's urine contained GW1516 sulfone. The substance was found in a test conducted on March 17 and is a so-called metabolic modulator -- which helps boost the production of hormones which can enhance an athlete's performance.

The rate of positive doping tests in South Korean sports reached a four-year low in 2012, the country's top anti-doping body said Tuesday.The Korea Anti-Doping Agency said it conducted 2,830 tests last year and 15 athletes tested positive for illegal substances.The KADA said it tested "B" samples for some athletes to confirm their doping. The positive test rate for 2012 came to 0.53 percent, the lowest since 0.49 percent in 2008.

World athletics championships hosts Russia on Monday rejected claims they are soft on doping, saying the exposure of a spate of high-profile cheats was due to a step forward in testing. A number of Russian athletes, including 2004 Olympic hammer champion Olga Kuzenkova, have been banned in recent months for doping violations, prompting calls in some quarters for Moscow to be stripped of its right to host the championships later this year.

By Gennady Fyodorov MOSCOW (Reuters) - Russian athletics chief Valentin Balakhnichyov said he expected more doping cases involving Russian athletes to be revealed in the future because the country conducted more drugs tests than any other nation. "Don't be surprised if you hear about a few more suspensions coming our way," the president of the Russian athletics federation (VFLA) told Reuters on Monday following an inspection visit by top officials from the sport's governing body IAAF.