The Wagner mercenary group’s mutiny last month caused major “friction and confusion” in Russia’s command, but it is yet unclear how it is affecting the front lines in Ukraine, the top general of the United States said on Thursday.

The June 24 mutiny, led by Wagner chief Yevgeny Prigozhin, was swiftly put down in a deal purportedly mediated by Belarusian leader Alexander Lukashenko. Prigozhin’s fighters had driven hundreds of miles into Moscow with almost no resistance on the ground after seizing the southern city of Rostov-on-Don.

Prigozhin has said the mutiny was not aimed at overthrowing the government but at “bringing to justice” the army and defense chiefs for what he called their blunders and unprofessional actions in Ukraine.

“At the strategic level it is pretty clear that you have a significant amount of friction and confusion,” General Mark Milley, the chairman of the Joint Chiefs of Staff, told a small group of reporters traveling with him in Asia.

“There’s a lot of drama going on at the very senior levels. How that’s all going to play out at the end of the day? I’m not so sure yet,” Milley said. “I don’t think we’re done with it. I think there’s many more chapters to be heard on that.”

Milley said that lower-level Russian troops in Ukraine were likely more focused on the situation on the ground and surviving day to day.

Since the mutiny, which posed the biggest domestic challenge to the Russian state in decades, President Vladimir Putin has so far kept Defense Minister Sergei Shoigu and Chief of the General Staff Valery Gerasimov in their jobs.

Putin initially condemned the mutineers as traitors, then said they would be permitted to decamp to Belarus. In the latest surprise, the Kremlin said this week that Putin met Prigozhin and his commanders just five days after the mutiny.

The exact whereabouts of Prigozhin have not been revealed. Lukashenko first announced Prigozhin was in Belarus, then said last week that he was back in Russia.

“I think he goes back and forth (between Russia and Belarus) to tell you the truth,” Milley said, but declined to say exactly where he believed Prigozhin was.