Turkey is planning retaliatory steps against Berlin after Germany's parliament recognised the World War I killings of Armenians by Ottoman forces as a genocide, the presidency said on Wednesday.
Turkish President Recep Tayyip Erdogan had reacted furiously to last week's vote, charging that German MPs of Turkish origin who backed the move were supporters of "terrorism" and declaring that Ankara would never accept a genocide took place.
Turkish authorities including the foreign ministry are now "preparing an action plan against the decision made by the German federal parliament," presidential spokesman Ibrahim Kalin told a news conference in Ankara.
The final plan will be submitted to Erdogan for approval, Kalin added, without giving details of the retaliatory measures being considered.
The vote has sparked a bitter diplomatic row between the two countries -- at a time when the EU is counting on Turkey to block the flow of migrants to Europe -- with Ankara recalling its ambassador from Berlin for consultations.
Armenians say Ottoman forces killed some 1.5 million of their people in a genocidal campaign from 1915 by Ottoman forces -- ordered by Minister of War Enver Pasha and other top officials -- to wipe them from Anatolia.
But Turkey insists similar numbers of Muslims and Armenians were killed when Armenians joined forces with invading Russian troops in the hope of carving out their own state.