In his post, he explains why some of Telegram's features, such as the stickers, do not work properly with iOS 11.4. Durov said that Apple prevented the company to update its iOS app, "since the Russian authorities ordered Apple to remove telegram from the App Store." If you recall, the country in mid-April after a year in which it threatened to do so, issued a ban on secure messaging. The authorities attacked the app because they refused to hand over their decryption keys, which would allow them to read users' messages as part of their anti-terrorism measures.
"We believe that we have done the only possible thing to help our users privacy in a troubled country," Durov said. "Unfortunately, Apple has not relied on us."
In a sequential tweet, Durov thanked Apple and Tim Cook for allowing his team to deliver the latest version of Telegram to millions of users. Neither side explained what was really going on behind the scenes and why Apple did not approve the updates for anyone around the world if the app was banned only in Russia. It is also unclear whether this is a one-time update that could lead to problems if Telegram can not close a vulnerability or if they have fixed bugs between them. Either way, you can download the iOS update if you do not want to see any corrupted features.