KYIV, Ukraine (AP) — Russian-installed authorities in Ukraine told all residents of the city of Kherson to leave “immediately” Saturday ahead of an expected advance by Ukrainian troops waging a counteroffensive to recapture one of the first urban areas Russia took after invading the country. In a post on the Telegram messaging service, the pro-Kremlin regional administration strongly urged civilians to use boat crossings over a major river to move deeper into Russian-held territory, citing a tense situation on the front and the threat of shelling and alleged plans for “terror attacks” by Kyiv. Kherson has been in Russian hands...