Russian President Vladimir Putin says medals won at Rio 2016 will be devalued by the banning of Russian competitors.
What events make up a triathlon? Who are the main competitors to look out for? And what are Team GB's prospects?
Great Britain's Jodie Stimpson finishes fourth in the elite women's race at the Triathlon World Series event in Hamburg.
Javier Gomez will not challenge Alistair and Jonny Brownlee in the triathlon at Rio 2016 after breaking his elbow.
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Derry triathlete Aileen Reid says she wants to put the experience of London 2012 behind her and "do herself justice" at the Rio Olympic Games.