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And it is a pretext, as freedom of navigation in the South China Sea has never been a problem. Hundreds of thousands of commercial ships pass through the strategic waterway each year transporting an estimated trillion worth of goods. Not a single one has found its freedom of navigation compromised.

And it is not just these economic barriers to get medical devices and spare parts into Venezuela that have led to the collapse of the sector.

Andrei Bazilevsky, director of the children's care center, gave brief but warm opening remarks at the welcoming ceremony.

Analysts noted that the US pullout, rumored for months, would cause concern among European allies.

Andrew Cohen in New York contributed to this story.