Russian opposition leader Alexei Navalny attends a rally in memory of politician Boris Nemtsov, who was assassinated in 2015, in Moscow, Russia February 24, 2019. [Reuters/Tatyana Makeyeva]
MOSCOW (Reuters) - Russian opposition leader Alexei Navalny, currently serving a jail stint for calling for unauthorized protests, was hospitalized after suffering an acute allergic reaction on Sunday, his spokeswoman said.