US President Donald Trump took to Twitter Tuesday to thank China for attempting to resolve tensions with North Korea, but declared that Beijing’s “efforts” had failed.

“While I greatly appreciate the efforts of President Xi & China to help with North Korea, it has not worked out. At least I know China tried!” Trump wrote.

The tweet came a day after the death of Otto Warmbier — a US student who returned in a coma from prison in North Korea — and on the eve of a first US-China strategic security dialogue.

Xi Jinping, Kim Jong-un and Donald Trump. Photo: Wikicommons.

Since coming to office, Trump has tried to get Beijing to put pressure on Pyongyang over its nuclear and ballistic missile programs.

It was unclear if the tweet was a signal that those efforts have failed. That conclusion could be seen as a warning of unilateral US action to follow.

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