KYIV, Ukraine (AP) — The bodies of more than 900 civilians have been discovered in the region surrounding the Ukrainian capital following Russia’s withdrawal — most of them fatally shot, police said Friday, an indication that many people were “simply executed.”

The jarring number emerged shortly after Russia’s Defense Ministry promised to step up missile attacks on Kyiv in response to Ukraine’s alleged assaults on Russian territory. That ominous warning followed the stunning loss of Moscow’s flagship in the Black Sea, which a senior U.S. defense official said Friday was indeed hit by at least one Ukrainian missile.

Amid its threats, Moscow continued preparations for a renewed offensive in eastern Ukraine. Fighting also went on in the pummeled southern port city of Mariupol, where locals reported seeing Russian troops digging up bodies. In the northeastern city of Kharkiv, shelling of a residential area killed seven people, including a 7-month-old child, and wounded 34, according to regional Gov. Oleh Sinehubov.