
The Trump administration's decision to suspend all US military aid to Ukraine has called into question the value of billions of dollars in weapons and equipment.
Sky News has examined the scale of US military aid so far and what is at stake now.
The United States has sent $21 billion in military aid to Ukraine since the start of the war.
“About half of the military equipment sent to Ukraine is provided by the Americans,” says former UK Ministry of Defense analyst Paul Moorcraft.
"In addition, they are the most advanced equipment – whether it is information, satellites or tanks. This will paralyze the Ukrainian army in about two months."
One of these important pieces of equipment is HIMARS, a US-made medium-range rocket launcher.
Ukrainian President Volodymyr Zelensky praised the weapon after his country's counteroffensive in 2022, saying: "HIMARS and other precision weapons are turning the war in our favor."
Together with the ATACMS, a US-made supersonic ballistic missile, the HIMARS has enabled Ukraine to strike logistics centers and airstrips deep inside Russian-occupied territory. The United States has sent 32 of the 35 HIMARS systems known to have been delivered to Ukraine.
Sky News military analyst Sean Bell says these two systems, along with US-supplied Howitzer artillery, are the most crucial pieces of equipment for Ukraine's efforts to hold the front line.
The war in Ukraine has shifted to a predominantly ground conflict, where heavy weaponry such as tanks and artillery have assumed particular importance.
The US has allocated $14.6 billion for heavy weaponry to Ukraine since the start of the war. This is the largest amount given by any individual country, but is significantly less than the amount given by the European Union as a whole ($18.9 billion).
During 2024, the US announced that it will send 5,168 heavy weapons to Ukraine, including Stryker and M113 armored vehicles and counter-artillery radars.
It is not clear how many were actually delivered to Ukraine, as the US has not publicly acknowledged the delivery of any of the items.
The US shipments also include at least 7,000 Javelin anti-tank missiles. These missiles were first sent to Ukraine during President Trump's first term in 2017, before Russia fully invaded the country.
President Zelensky highlighted the weapons in a social media post on Tuesday, writing: “ We remember the moment when everything changed, when President Trump provided Javelins to Ukraine. We are grateful for that .”
Moorcraft says advanced equipment, like US-made Abrams tanks and Bradley fighting vehicles, require frequent repairs using spare parts that only the US can provide.
It also remains unclear whether the US plans to cut Ukraine off from Starlink, the satellite communications network owned by Elon Musk.
Last month, it was reported that the US had threatened to cut Ukraine off from this network if President Zelensky did not agree to sign a deal on the minerals.
The deal fell through last week after a visit by Zelensky to the White House that ended in acrimony.
Ukraine is losing equipment as the war continues
Without continued arms shipments, Ukraine's capabilities will weaken over time as equipment is damaged, destroyed, or captured.
In the six weeks since Trump's inauguration, defense analysis firm Oryx has verified the loss of hundreds of Ukrainian vehicles, including 57 tanks.