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Ukrainian President Volodymyr Zelenskyy has fired a senior official amid a corruption investigation involving a deputy head of the presidential office. This development Wednesday follows the recent dismissal of the defense minister, who is calling for national elections in a direct challenge to Zelenskyy despite Russia's 4-year-old full-scale invasion. The graft investigation centers on money laundering linked to a major corruption case. Although Zelenskyy isn't implicated, the situation poses a political challenge. Ukraine has seen military successes in recent months but is struggling to counter Moscow's missile attacks. Amid the political tensions, U.S.-led peace efforts have been rebuffed by Russian President Vladimir Putin.