In a city in southern Siberia, security forces detained a man in October for reading antiwar poetry at a literary event. Authorities in Novosibirsk fined a woman 15,000 rubles around the same time for tearing down a poster exalting Russian soldiers fighting in Ukraine.In St. Petersburg, a man was briefly detained in September for holding a poster reading, “Wishing for peace is not a crime! I am against war.” The cases, all documented by OVD-Info, a human-rights group that monitors police detentions and helps protesters find lawyers, speak to new levels of repression in Russia, as President Vladimir Putin seeks to crush even the most innocuous opposition to his war on Ukraine. Prominent opposition politicians, human-rights activists and journalists have been jailed for lengthy terms, slapp...