“We do train, we do prepare for the games and, in our case, during the opening ceremony, we have our own Olympics final,” Mr. He recalled breathing a sigh of relief when the biggest controversy around the opening ceremony two years ago in Paris related to artistic performance and not a security failure. Still, before dawn on the day of the opening ceremony, a sabotage attack disrupted France’s high-speed rail network, stranding thousands of travelers and marring a moment of national glory. No group claimed responsibility. In 2018, a major cyberattack led to the unprecedented disruption of the opening ceremony of the Winter Olympics in Pyeongchang, South Korea. The attack took out internet access and telecasts, grounded drones that were supposed to be part of an elaborate set piece and shut down the Games’ website. It also prevented spectators from printing out tickets and attending the ceremony, resulting in an unusually high number of empty seats. That attack was ultimately attributed to Russia, which, according to the British government, had attempted to disguise the attack as one perpetrated by North Korea

Source