Ukraine's foreign minister thinks reports of atrocities by Russian troops near Kyiv could turn out to be much worse.

Footage has emerged showing mass graves, as well as civilians lying dead on the street - with hands tied behind their back.
Moscow insists it was all staged by the Ukrainians.
Ukraine's President's going to address the United Nations Security Council later, after widespread international condemnation to what appears to be the mass killing of civilians in the Kyiv region.
Russia denies responsibility.
It instead says the West has staged footage of bodies lying in the street.