TOKYO -- With Russia now more than a month into its invasion of Ukraine and showing little sign of backing down, how has Russian President Vladimir Putin's mindset changed over the course of the conflict? The answer may lie in his voice.
Ukraine war
Is Putin cracking? Voice analysis belies steely exterior
Russian leader's initial optimism of conflict gave way to high stress, audio indicates
An analysis of Russian President Vladimir Putin's speech on the anniversary of the annexation of Crimea indicated lower stress levels but an inward-looking mindset. (Source photo by Getty Images)
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