The Turkish parliament speaker's visit to Ukraine has been postponed, his office said on Friday.

Mustafa Sentop was due to leave on Friday for a two-day visit to Ukraine, but the trip has been put off after Thursday's helicopter crash in which 11 soldiers were martyred, according to a statement.

A new schedule for the visit will be announced later, his office said.

Later, Sentop thanked his Ukrainian counterpart Dmitry Razumov who offered his condolences over the crash in a Twitter message.

"My dear counterpart, thank you for being with us on this sad day and sharing our pain," he said on Twitter.