The EU's chief Brexit negotiator, Michel Barnier, said this in Brussels on Thursday, an Ukrinform correspondent reports.
"This week the UK explained that these obligations will be limited to their last payment to the EU budget before departure. Yet we have joint obligations towards third countries. For example, we have guaranteed long-term loans to Ukraine, together," he said.
He also said that at this stage the EU and Britain had not made sufficient progress in negotiations on Britain's withdrawal from the EU.