People carry signs with question marks during a march in central Kiev to commemorate the death of investigative journalist Pavel Sheremet.

A man carries a sign reading "a year has passed, who killed Pavla?" during a march in central Kiev to commemorate the death of investigative journalist Pavel Sheremet.

A man carries a sign reading "a year has passed, who killed Pavla?" during a march in central Kiev to commemorate the death of investigative journalist Pavel Sheremet.

A man carries a sign reading "a year has passed, who killed Pavla?" during a march in central Kiev to commemorate the death of investigative journalist Pavel Sheremet.