As Russian opposition leader Alexei Navalny is once again in court, facing charges that could extend his time in prison by 30 or more years, he is showing that he is not giving up his uneven but unyielding challenge to the Putin regime.

When Navalny returned to Russia in January 2021 after recovering from a government attempt to poison him, it was to no one’s surprise that he was immediately arrested and sent to prison for nine years on spurious parole violation charges (which included the surreal accusation that he was in breach for not reporting to the police while he...