Washington, Aug. 30 -- Washington's attempt to broker progress in the Ukraine conflict is being overshadowed by growing concerns over the role of Steve Witkoff, President Donald Trump's personal confidant turned special envoy for peace missions, with sources attributing the failure of the Anchorage summit to his "inexperience".

Witkoff, a real estate developer with no formal diplomatic background, has met Russian President Vladimir Putin five times in six months and was instrumental in arranging Trump's surprise Anchorage summit with the Russian leader, reports Politico.

Yet U.S., Ukrainian and European officials say his access has not translated into tangible results, with promised follow-ups between Putin and Ukrainian President Volodym...