European Energy Commissioner Guenther Oettinger said he was aiming to arrange further talks to solve the gas pricing row between Moscow and Kiev, which has led Gazprom to reduce supplies to Ukraine.
Kiev failed to meet a deadline this morning to pay off its gas debts in a dispute that could disrupt supplies to the rest of Europe.
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The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".