MOSCOW, July 29 (Reuters) - Russia said on Wednesday it had charged Telegram founder Pavel Durov with facilitating terrorist activity, alleging that his hugely popular messaging app was being used by Ukrainian spies to organise attacks inside Russia. The charges, announced by the ‌Federal Security Service (FSB), marked the culmination of a long investigation against Dubai-based Durov and Telegram. Russians can only access Telegram now by using a VPN to encrypt traffic and conceal their location. Dubai, where Durov lives, has friendly relations with Moscow and growing ties in energy, business and finance. Durov denies wrongdoing and says ​Telegram has exceeded its obligations to ​moderate content and cooperate with authorities to fight crime.