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.
Nikkei and Yokohama-based Risk Measurement Technologies looked at 1 hour and 19 minutes of voice samples from Putin from between Feb. 1 and March 18. An analysis of the audio suggests his stress levels were elevated starting in the days before the invasion and climbed sharply in early March, when Moscow responded to the tightening sanctions net around the country.
