Questions continue about what U-S president-elect Donald Trump will do in the area of foreign policy.
Mr Trump has spoken on the phone with Russian president Vladimir Putin, agreeing to work to improve relations between the United States and Russia.
There's nervousness in the rest of Europe about what an improved Russia-United States relationship could mean.
But outgoing U-S president Barack Obama is keen to reassure the world that present U-S alliances remain strong.
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