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"Oleh Sentsov and Oleksandr Kolchenko, detained and sentenced in breach of international law, should be immediately released and guaranteed a safe return to Ukraine," she said in her declaration published on the official website of the European Council.

Read alsoKremlin Ukrainian prisoners: Sentsov convoyed to Irkutsk, Kolchenko to ChelyabinskAccording to Mogherini, "full, free and unrestricted access for international human rights actors to the whole territory of Ukraine, including Crimea and Sevastopol, continues to be paramount."