MOSCOW—The sudden and mysterious disease that still left Kremlin critic Alexei Navalny in a coma has shipped a blow to Russia’s political opposition, throwing into question its foreseeable future at a time when the Kremlin has stepped up its efforts to stamp out dissent.
Mr. Navalny fell unwell on a flight from Siberia to Moscow final 7 days following ingesting a cup of tea that his supporters say was laced with poison. He was evacuated to a Berlin healthcare facility on Saturday. Doctors there haven’t disclosed any information of his condition or what they believe that…