By Tudor S. // DiplomacyFormer MI6 Head on Ukraine negotiations: "The key [...] is whether Putin will turn up in Istanbul."Ukrainian President Volodymyr Zelenskiy addresses the media during a press conference in Kyiv, as Russia's assault on Ukraine continues, Ukraine May 13, 2025. REUTERS/Valentyn OgirenkoListen to this articleRelated Podcast EpisodesSee what else is making headlinesBy One Decison // DiplomacyFormer US Ambassador: "Putin has to swallow an agreement that is less than he promised."