Russia will send a second aid convoy to eastern Ukraine "in the coming days", foreign minister Sergei Lavrov said.
"The humanitarian situation is not improving but deteriorating," Lavrov told a news conference.
"We want to reach an agreement on all conditions for delivering a second convoy by the same route... in the coming days."
International leaders condemned Russia's decision to authorise a convoy of lorries carrying aid to cross the Ukrainian border without permission.
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