KYIV, Ukraine (AP) — The latest in a litany of horrors in Ukraine came this week as Russian firepower rained down on civilians in a busy shopping mall far from the front lines of a war in its fifth month.

The timing was not likely a coincidence.

While much of the attritional war in Ukraine's east is hidden from sight, the brutality of Russian missile strikes on a mall in the central city of Kremenchuk and on residential buildings in the capital, Kyiv, unfolded in full view of the world and especially of Western leaders gathered for a trio of summits in Europe.

Were the attacks a message from R...