When Pavel Durov, a Russian tech entrepreneur who founded the Telegram messenger app, was arrested in Paris on Aug. 24 on accusations of allowing terrorism to blossom on his platform, Ukraine watched it closely. He was charged by a Paris court on Aug. 28. In Ukraine, the charges against Durov reinvigorated the public debate about the security of Telegram. Some activists and officials have long sounded an alarm about the fact that while the country is surviving a full-scale invasion by Russia, its most popular messenger app and source of news is a platform founded and run by a Russian. The popu…