"EU calls on Russia to free all Ukrainian citizens illegally detained, tried, or convicted in Russia/illegally annexed Crimea," reads the statement.
Earlier, Ukrainian Deputy Foreign Minister Serhiy Kyslytsia called on the OSCE's Office for Democratic Institutions and Human Rights to influence Russia for the release of Ukrainian political prisoners.
OSCE/ODIHR holds an annual human dimension implementation meeting in Warsaw from September 11 to September 22.
On September 11, a Russian court in Crimea sentenced Akhtem Chiygoz to eight years in prison.
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