An ambitious plan by the UN's shipping agency to cut maritime emissions could be scuttled at the last minute after the United States threatened to impose sanctions on those supporting it.

Already approved in April, members of the London-based International Maritime Organization (IMO) are set to formally adopt the Net Zero Framework (NZF) on Friday as part of talks opening Tuesday.

The framework requires ships to progressively reduce their carbon emissions starting in 2028, and achieve complete decarbonisation by 2050.

But the United States on Friday threatened sanctions and other punitive actions against those who support it, potentially derailing the plans.

Top US diplomat Marco Rubio, Energy Secretary Chris Wright and Transportation Secretary Sean Duffy said in a statement the admini

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