From a Reporter’s Notebook on politico.eu by Jamie Dettmer headlined “‘They killed everyone.’ Fury in Ukraine at Russian barbarity”:

KYIV — U.S. army veteran Ryan O’Leary looks a little unsteady and draws heavily as he smokes — unsurprising after what he’s seen and done over the past month during some vicious firefights on the northern outskirts of Kyiv, for weeks among the most intense front lines in Ukraine.

Added to that, he was clearly aghast at what he had seen in the last 48 hours, assisting with clean-up operations in the town of Bucha, northwest of Kyiv, in the wake of a Russian withdrawal that was part rout.