Are the Wagner Group's Days in Ukraine Numbered?

Not long ago, the Wagner Group, founded by Russian businessman Yevgeny Prigozhin, was viewed by the Kremlin as a key instrument in the war in Ukraine started by Vladimir Putin.

Its fighters, largely Russian convicts, have been the only soldiers to have achieved any notable successes on the battlefield in recent months.

In January, Prigozhin claimed credit for the capture of Soledar, a small salt-mining town in Ukraine's eastern Donetsk region. The Wagner Group, however, has failed to make significant advances in the nearby eastern industrial city of Bakhmut, where it has...