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'To Russia and Ukraine, get to the table right now, before it is too late,' Trump said.
The reserve will be capitalised with bitcoin owned by the US government that was forfeited as part of criminal or civil asset forfeiture proceedings.
Trump's warning came hours after the United States confirmed it is holding secret talks with Hamas on securing the release of US hostages held in Gaza.
The court, in its first significant ruling on a legal challenge to the Trump administration, voted 5-4 to uphold a lower court order requiring that payments be made on aid contracts that have already been completed.
President Donald Trump and Ukraine's leader Volodymyr Zelensky had a public falling-out in the Oval Office last week, followed by Ukraine's top ally suspending crucial US military aid.
Zelenskyy called for a "truce" in the sea and sky as a first step to securing an end to the three-year-long war.
Trump's comments triggered a selloff in global stocks and pushed bond yields lower.
The White House had no immediate comment on the scope and amount of aid affected or how long the pause would last.
The US president also opined that the European Union was born to "screw" the country.
Some commenters questioned whether the president's accounts had been hacked.
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