There is significant evidence that Russia was involved in a sweeping state-sponsored doping program at the 2014 Winter Games in Sochi, Russia. As a result, the country and many of its athletes have been hit with penalties.

But at least 150 Russian athletes will be competing at the Winter Olympics. So what are they doing there? It has been a tale of charges, countercharges, appeals and counterappeals. And it’s not over yet.

Confused? You are not alone. We can help.

Why is Russia at the Olympics? The International Olympic Committee in December barred Russia from the Games, citing systematic doping. Russian government officials are forbidden to attend, the Russian flag will not be displayed at the opening ceremony and the anthem will not sound.

But as in 2016, the Olympic committee said that Russian athletes with a history of rigorous drug testing could petition for permission to compete.