Ukraine conflict: Putin lays out his demands in Turkish phone call

The first four demands are, according to Mr Kalin, not too difficult for Ukraine to meet.

Chief among them is an acceptance by Ukraine that it should be neutral and should not apply to join Nato. Ukraine's President Volodymyr Zelensky has already conceded this.

There are other demands in this category which mostly seem to be face-saving elements for the Russian side.

Ukraine would have to undergo a disarmament process to ensure it wasn't a threat to Russia. There would have to be protection for the Russian language in Ukraine. And there is something called de-Nazification.

The second category is where the difficulty will lie, and in his phone call, Mr Putin said that it would need face-to-face negotiations between him and President Zelensky before agreement could be reached on these points. Mr Zelensky has already said he's prepared to meet the Russian president and negotiate with him one-to-one. read more