Amid uncertainty about the details of the weapons being withheld, the American move was being described as a halt, a suspension or a pause in supplies.
In March, Trump suspended weapons shipments in a bid to force Ukrainian President Volodymyr Zelensky to agree to terms with Russian President Vladimir Putin.
Ukrainian President Volodymyr Zelensky at the NATO summit last month.Credit: Getty Images
This second stoppage, first reported by news site Politico, is said to be driven by senior Pentagon official Elbridge Colby, a key advocate for increasing domestic weapons capabilities rather than putting a priority on allies.
Colby is also conducting a snap review of the AUKUS pact with Australia and Britain, raising concerns of a shift in American policy to curtail the transfer of nuclear submarine technology or demand the allies spend more on the deal.
The latest move means Ukraine will go without supplies of PAC-3 missiles for the Patriot air defence system. Zelensky had asked Trump for more Patriot weaponry to shoot down Russian missiles when the two leaders met at the NATO summit in the Netherlands last week.
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Also in short supply in Ukraine are precision artillery rounds and Hellfire missiles for F-16 fighter jets.
American assistance to Ukraine was worth €26.8 billion – about $48 billion – in the three months to December, but has collapsed since Trump took office in January, according to the database of military, financial and humanitarian aid compiled by the Kiel Institute for the World Economy.
The respected database recorded less than €1 billion in US assistance in the March quarter.
Europe filled some of the gap by increasing assistance from €9.5 billion to €19.1 billion over the same period, but Ukraine has warned that it cannot defend its citizens from Russian missile attacks without more supplies.
White House spokesperson Anna Kelly confirmed the new decision to suspend weapons and said the US was putting a priority on the capabilities of the Department of Defence (DOD).
“This decision was made to put America’s interests first following a DOD review of our nation’s military support and assistance to other countries across the globe,” she told reporters.
“The strength of the United States Armed Forces remains unquestioned – just ask Iran.”
Despite that confirmation, the Ukrainian Ministry of Defence appeared unaware of the details of the weapons halt and said it had requested a telephone conversation with American defence officials.
“It is critically important for Ukraine to maintain stability, continuity, and predictability in the provision of coordinated defence assistance, primarily in the area of strengthening air defence systems,” the ministry said on social media site Telegram.
“We are grateful to the United States for all its support and highly appreciate the efforts of American partners aimed at achieving genuine peace.
“We emphasise that the path to ending the war lies through consistent and joint pressure on the aggressor, as well as through continued support for Ukraine.”
Some Republicans in Congress warned against the Trump administration’s decision within hours of the move, with Pennsylvania Representative Brian Fitzpatrick telling Politico he would be “aggressively looking into this matter”.
Another Republican, Michael McCaul of Texas, said he was probing the matter “very intensely” because the pause could weaken attempts to get Putin to agree to a peace deal.
