(CNN) Roughly 70% of Russia's Olympics contingent has been cleared to take part in the Rio Games, but that doesn't mean competitors or spectators have to like it. Fans sounded off during Friday's Opening Ceremony, turning the normally jubilant parade of nations into mixed commentary on the decision to let 271 of Russia's 389 athletes compete despite a report accusing the country of "state-sponsored doping." International Olympic Committee spokesman Mark Adams said Monday it was a shame the Court of Arbitration for Sport wasn't "tougher on doping," but that Olympics officials have no choice but to accept the decision. "These are people who have served sanctions and are now clear ..." he said. "There are athletes from many teams who have served sanctions and are able to compete."U.S.'s Lilly King, Russia's Yuliya Efimova to face off Monday after exchange of fingersOlympics fans have been casting boos at Russian athletes after doping allegations, bans
Some wore _ flags around their necks like capes, while others blew kisses to the cameras.