Even as Russia seems to have the upper hand in its invasion of Ukraine, the Kremlin faces a growing number of challenges that will complicate any effort to lock in its gains, the outgoing Pentagon chief said.

Ahead of President-elect Donald Trump’s return to office, Ukraine’s future course is shrouded in uncertainty as it loses ground to Russia’s far larger military.

Outgoing Pentagon chief Lloyd Austin has said that even though Russia appears to have the upper hand in its invasion of Ukraine, the Kremlin is facing a growing number of challenges that will complicate any attempts to consolidate its gains.