If you have UFC Fight Pass, you are eligible to watch UFC 252 Preliminary Fights. To open the access to the main event, you will need to buy the PPV from the UFC.tv. All you need to do is just hitting the order button in the UFC.tv. Choose the UFC 252 PPV package. Keep in mind that you could also choose to watch the bout a month later when it is added to your Fight Pass library.
Sling TV has been amongst the top choices because of its affordable service. You could purchase the PPV right through the Sling TV official site of the app. However, it might be open when the time is close to the event. Meanwhile, you can wait until the order button appear. Consider to register and subscribe to the $25 service so that you can enjoy the excellent entertainment stuff.
Viewers in Russia can order the PPV Package to watch the UFC 252 live from their favorite device. You could tune in Fox Sports or ESPN to watch the preliminary fights for free. The good thing here is that you can also use your UFC Fight Pass to watch the boats excluding the main event. Check your full options in the UFC.tv. MatchTV is the official broadcaster in Russia. You could also purchase the PPV through the channel.