His private army is pushing hard to give Russia a battlefield win in Ukraine, but mounting evidence suggests the Kremlin has moved to curb what it sees as the excessive political clout of Yevgeny Prigozhin, founder of Russia's Wagner mercenary group. Prigozhin, a 61-year-old ex-convict, has grabbed headlines in recent months over his bloody role in Ukraine and is sometimes portrayed in the West as a real-life James Bond villain. Shaven-headed and fond of coarse language, he has made a splash in Russian-language media too where he has revelled in being sanctioned by the West, publicly insulted Russia's top military...