A source close to the matter said the case involved meldonium -- the same substance that saw Maria Sharapova banned

Russian Olympic curler involved in doping case: sources

Yun clocked a combined time of three minutes, 20.55 seconds for his four runs, with Nikita Tregubov, an Olympic Athlete From Russia, taking silver

Korean 'Iron Man' Kim wins historic Olympic skeleton gold

The Swiss Olympic team did not name the two athletes but report says it was the freestyle skiers, Fabian Boesch and Elias Ambuehl

2 Swiss athletes sick with norovirus at Winter Olympics

US defense secretary Jim Mattis said the recent Olympic bonhomie between the two countries did not mean peace will reign on the Korean peninsula.

North Korea has strong will to improve inter-Korean relations: South Korea

Cyber security experts had warned of potential attacks on the Winter Olympics, with both North Korea and Russia touted as possible sources

Pyeongchang 2018: Winter Olympics hit by cyber attack, source not revealed

Organisers of the Pyeongchang 2018 Winter Olympic games are warning spectators that they will face sub-zero temperatures during the tournament

Winter Olympics 2018 likely to be 'coldest' in history

Kim Jong-Un in his new year speech said his country wished success for the Olympics and would consider sending a delegation

North Korea 'likely' to join Winter Games, says IOC official

Some 2000 athletes from 31 countries will be competing in five sports across 64 events in Japan

Japan to host Asian Winter Games

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