Activists with their mouths covered by band-aids, stand chained together, in central Kiev, Ukraine, Friday, May 10, 2019. The activists performed a symbolic march to the embassies of the European Council member states and handed over the letters to highlight the fact that Ukrainian political prisoners are still being kept in Russian jails. (AP Photo/Efrem Lukatsky)

Activists, with their mouths covered by band-aids, stand chained together, in central Kiev, Ukraine, Friday, May 10, 2019. The activists performed a symbolic march to the embassies of the European Council member states and handed over the letters to highlight the fact that Ukrainian political prisoners are still being kept in Russian jails. (AP Photo/Efrem Lukatsky)