Hromadske.tv presents a documentary film “Contact” by Mustafa Nayyem and Bohdan Kutiepov. The topic of prisoner exchange in east Ukraine is still among those that are on the top of the agenda. But even in the most cruel war a front line can be crossed from time to time. Few people have such an exclusive right. They are called negotiators. Negotiators have a privilege to pass through block-posts without any hitches and to negotiate about the release of prisoners. That’s how the contact appears. Mr. Ruban's group, called Officer Corpus, – is the only hope for prisoners of war from both sides. The group crossed the neutral zone in order to complete the mission. Hromadske.tv has spent a day with Officer Corpus and and visited the separatists' main stronghold – Donetsk."