Russia’s parliamentary leaders plan to consider exiting an international treaty banning nuclear tests as a means of retaliation against Western support for Ukraine. “We are talking about the withdrawal of ratification of the Comprehensive Nuclear Test Ban Treaty,” State Duma Speaker Vyacheslav Volodin wrote Friday on social media. “The situation in the world has changed. Washington and Brussels have launched a war against our country. Today's challenges require new solutions.” Volodin embraced the idea after Russian President Vladimir Putin signaled his interest in the exit during his address to the Valdai Discussion Club. The Kremlin chief also positioned the withdrawal...