MOSCOW—A Russian court on Monday began reading the verdict in the high-profile case of a Ukrainian military pilot that has been condemned by Ukraine and the West as a show trial.

Prosecutors have called for 23 years in jail for Lt. Nadiya Savchenko for allegedly guiding a mortar attack that killed two Russian TV journalists and later illegally crossing the border into Russia. After a judge began reading the verdict Monday, Russian state news agencies reported that Lt. Savchenko had been found guilty. But one of her lawyers...