TODAY: Roskomnadzor blocks 50 VPNs to get at Telegram, Viber may also be targeted; activists detained and fined for waving non-Russian flags on Labour Day; Exxon Mobil ignoring sanctions for deal with Rosneft; Russia reaffirms OPEC pledge; troll factory targeting US energy? UK seeking to build on Skripal-based alliances; Putin expecting top soccer at World Cup.