was there any scandal occurred in any of the games in relation with russia?
Yes, many times between 2011 to 2015.
Olympic Games
 From 2011 to 2015, more than a thousand Russian competitors in various sports, including summer, winter, and Paralympic sports, benefited from a cover-up.
how does an athlete get to participate in the olympic games All professional athletes are eligible for the Olympics, subject to the approval of the IFs. what are these games? he modern Olympic Games or Olympics are leading international sporting events featuring summer and winter sports competitions. how different is it from the ancient games? In the ancient games, the competition was among representatives of several city-states and kingdoms of Ancient Greece. Whereas the modern games are international nature. do they have any symbol or logo? Yes, the Olympic rings which consists of five intertwined rings .
wiki:25637499
Olympic Games [SEP] Russian doping scandal
Doping in Russian sports has a systemic nature. Russia has had 44 Olympic medals stripped for doping violations – the most of any country, more than three times the number of the runner-up, and more than a quarter of the global total. From 2011 to 2015, more than a thousand Russian competitors in various sports, including summer, winter, and Paralympic sports, benefited from a cover-up. Russia was partially banned from the 2016 Summer Olympics and was banned from the 2018 Winter Olympics (while being allowed to participate as the Olympic Athletes from Russia) due to the state-sponsored doping programme. In December 2019, Russia was banned for four years from all major sporting events for systematic doping and lying to WADA.