Russian officials have fired several commanders following the nation’s “poor performance” in Ukraine, according to the U.K.’s Ministry of Defence (MoD).

The MoD said in a Sunday, August 7, tweet that at least six Russian commanders had been dismissed since Russian President Vladimir Putin ordered the invasion earlier this year.

It said: “The poor performance of Russia’s armed forces during its invasion of Ukraine has been costly for Russia’s military leadership, highly likely resulting in the dismissal of at least six Russian commanders since the start of hostilities in February 2022.”