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Meta declined to comment, but its annual report cites the possibility that tariffs or a trade dispute could result in a drop of its China-based ad revenue.

Finance chief Matthew Friend has also cited tariffs as an example of developments that were affecting consumer confidence.

"The post-election protest process preserves the fundamental right to vote in free elections 'on equal terms,'" the judges wrote in the opinion, citing legal precedent.

The authors of the Communications Earth and Environment paper cite, for example, research showing hydrochloric acid emitted from solid rocket launches killing fish after it leached into nearby water.

AFP, citing Mr Dhaliwal, said Mr Polyakov blew a whistle off the shore of the island in a bid to attract the attention of the tribe for about an hour.