It is not clear exactly what conditions the Obama administration may wish to impose, what the detainees’ immigration status would be or whether any detainees released to Europe would be eligible for complete freedom. “We understand, you have a big problem,” said one European official who said he would speak only if not identified. “And we appreciate what President Obama has said about closing Guantánamo. But that doesn’t automatically mean putting all the remaining inmates on a plane and sending them to Europe.”