UNITED NATIONS — President Donald Trump castigated the United Nations as a feckless institution in a speech to the world body on Tuesday, praising the turn America has taken under his leadership while warning Europe will be ruined if it doesn't turn away from a "double-tailed monster" of ill-conceived migration and green energy policies.

Later, the U.S. president broke with a previous stance, Ukraine can win back all territory lost to Russia rather than making concessions.

His roughly hourlong speech before the U.N. General Assembly was both grievance-filled and self-congratulatory as he used the platform to applaud his second-term achievements and lament that some of his fellow world leaders' countries were "going to hell."

The address was the latest reminder for U.S. allies and foes t

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