OSCE Representative on Freedom of the Media Dunja Mijatovic has welcomed the commitment by the authorities, the media community and civil society to strengthen media freedom in Ukraine, ending a four-day visit to Kyiv. She also called on the authorities to intensify their efforts to end impunity for crimes committed against journalists, OSCE said on its website on Friday.

Mijatovic met Foreign Minister Pavlo Klimkin and stressed that the cases of Ukrainian journalists Roman Suschenko, detained in Moscow, and Mykola Semena, under house arrest in Crimea, remain at the top of her agenda.

"I am receiving more reports of threats made against journalists, especially online, and particularly targeting those involved in investigative journalism," Mijatovic said.

"Harassing and labeling journalists as traitors is unacceptable in a democracy," she said.

Mijatovic also met with Sevgil Musaeva, the editor-in-chief of Ukrayinska Pravda, and paid tribute to journalist Pavel Sheremet, who was killed by a car bomb in July.

"All journalists killed in Ukraine, including Georgiy Gongadze, Oles Buzina and Viacheslav Veremiy, deserve full justice to be served. Impunity puts every journalist at risk," she said.

"It is unfortunate that I still have not been able to travel to the eastern part of Ukraine and to Crimea and the city of Sevastopol in order to meet journalists and civil society to make first hand assessment of media freedom issues that according to reports need immediate engagement by my Office," she said.