A prominent Russian opposition leader was discharged from a Moscow hospital Monday and sent back to jail, despite claims by his doctor that he may have been poisoned by an unknown chemical agent while in custody. Navalny was arrested several days before an opposition demonstration held on Saturday and is currently serving a 30-day sentence. More than 1,300 people were detained after protesting the exclusion of opposition candidates from Moscow's city council elections. In 2017, he suffered a partial loss of vision after being assaulted and doused with a green antiseptic. His sight was restored after he sought treatment abroad.