US Secretary of State Marco Rubio sought to reassure a nervous Europe on Saturday, saying that Washington wanted to "revitalise" the transatlantic alliance so that a strong Europe could help the US on its mission of global "renewal".

Speaking at a security conference in Munich after months of turmoil in US-European relations sparked by US President Donald Trump's vows to seize Greenland and his often derisive remarks about Washington's allies, Washington's top diplomat struck a markedly soothing tone.

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