Turkey believes a ceasefire must first be secured between Russia and Ukraine before it and other states take any decisions on a peacekeeping mission as part of security guarantees for Ukraine, a defence ministry source said on Thursday.

When it comes to striking a deal, details matter. For proof of this adage, look no further than the confusion created this week by Donald Trump. First, he left open the possibility of US troops on the ground to guarantee Ukrainian security in the aftermath of any potential peace deal with Russia.