Ukraine said Tuesday it is investigating a claim that a poisonous substance was dropped on the besieged city of Mariupol. Deputy Defense Minister Hanna Maliar said it was possible that phosphorus munitions — which cause horrendous burns but are not classed as chemical weapons — had been used.
Now the question is how to establish the truth amid the fog of war that has descended over a city still under attack from Russian forces. A clear answer is unlikely to emerge any time soon.
