"Enis Berberoglu, was arrested for allegedly leaking documents purporting to show that the government was arming jihadists in Syria."
"accused of handing over evidence showing Turkish intelligence services transporting arms over the border to Syria"
"Turkey had tried to ship arms to rebels fighting the Syrian government."
Protests have erupted in Ankara over the jailing of an opposition secularist MP.
Enis Berberoglu from the Republican People's Party (CHP), the main opposition party, was sentenced to 25 years in prison for leaking "secret information" to a newspaper.
He is accused of handing over evidence showing Turkish intelligence services transporting arms over the border to Syria, a story which angered President Recep Tayyip Erdogan.
The editor and several writers from Cumhuriyet, which published the story, were detained in the wake of the July 2016 attempted coup as part of a widespread crackdown.