Russian soldiers and military bloggers have railed against the Kremlin after it restricted access to the Telegram messaging app. Widespread disruptions to the app were reported on Monday and Tuesday as Roskomnadzor, the Russian state media regulator, said it would levy its strongest restrictions on Telegram’s operations yet. The internet watchdog said the move would safeguard Russian citizens against “criminal and terrorist” content, in Moscow’s latest crackdown on the free internet. Roskomnadzor, which has for years crusaded for a “sovereign internet” liberated from Western influence, has over the past six months imposed new limits on Telegram and WhatsApp at least...