"It is happiness, a deep relief," German Colonel Axel Schneider told a small group of journalists on the road outside of the Ukrainian city of Donetsk.
He spoke as he and the rest of the freed members of the OSCE team were on their way to Donetsk, from where they flew to Kiev and then onwards to Berlin in a German jet.
The group, all men, consisted of seven Europeans -- four Germans including Schneider, one Pole, one Dane and one Czech -- as well as five Ukrainian military officers who had been accompanying them.
The rebels insisted that the prisoners -- whom they called "guests" -- would only be exchanged for militants taken prisoner by Ukrainian authorities.
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The observers spent the first hours of their captivity in a basement with their hands tied and eyes blindfolded, the Czech observer, Lieutenant Colonel Josef Prerovsky, told Czech television in Donetsk.
"Those first eight hours were the worst," he said.
The atmosphere became more tense yesterday, when the Ukrainian military launched an offensive on Slavyansk, with one of the aims to force the rebels to free the OSCE team.
"It was really tough the last two nights as we saw the situation developing then. Every minute gets longer," Schneider said.
In the end, after days of outrage from Western capitals over their captivity, direct intervention from a Kremlin envoy, Vladimir Lukin, resulted in their liberation.