Russian opposition leader challenging Vladimir Putin in March's presidential election can expect to be poisoned or imprisoned, according to prominent Putin ally Vladimir Solovyov. Boris Nadezhdin, a former State Duma member who is known for opposing Russia's war in Ukraine, announced on Wednesday that he was filing papers to challenge Putin in the election. The announcement came after a successful campaign to collect at least 100,000 voter signatures required to appear on the ballot. Solovyov, the host of a popular Russian state television show known for pushing Kremlin propaganda, warned Nadezhdin during a broadcast a short time later that his...