Yevgeny Prigozhin, whose Wagner Group of mercenaries has dominated headlines in Ukraine, has reportedly been sidelined by Vladimir Putin after failing to make good on his promises of military gains. The Institute for the Study of War (ISW) said Prigozhin's "star has begun to set" following his boasts that his forces could capture the Donetsk city of Bakhmut. The think tank said on Sunday that Putin wanted to see what Prigozhin and his previous commander in Ukraine, General Sergey Surovikin could do after the conventional Russian military had suffered disastrous setbacks. "Both efforts failed," the ISW said, as Prigozhin's attempts...