A Ukrainian Yak-42 plane carrying 62 Spanish peacekeeping troops and 12 crew crashed as it tried to land near Turkey's Black Sea city of Trabzon early on Monday, Turkish television said.
None of the passengers survived, television news channels reported.
The state-run Anatolian news agency said the plane was flying from the Kyrgyz capital of Bishkek to Zaragoza, Spain.
The plane was attempting to land at Trabzon's airport to refuel in heavy fog, when it crashed in a rural area in northeastern Turkey, Anatolian said.
"It was due to land here but it never did," an official at Trabzon airport told Reuters.
Private television station NTV reported that paramilitary police recovered 25 bodies but no one had survived.