Last week, the Russian authorities announced that Aleksei A. Navalny, Russia’s most prominent opposition leader and an unflinching critic of President Vladimir V. Putin, had died in a remote Arctic prison at the age of 47.Yevgenia Albats, his friend, discusses how Mr. Navalny became a political force and what it means for his country that he is gone.Guest: Yevgenia Albats, a Russian investigative journalist and a friend of Mr. Navalny.Background reading: Who was Aleksei Navalny?The sudden death of Mr. Navalny left a vacuum in Russia’s opposition. His widow, Yulia Navalnaya, signaled that she would try to fill the void.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.