Trump Cuts Military Aid, Ukraine's Air Defenses Vulnerable to Breach

The freezing of military aid by U.S. President Donald Trump's administration to Ukraine on Tuesday (4/3/2025) could have serious implications for Ukraine's air defense system. However, this does not mean that Ukraine will be easily subdued and immediately surrender.

So far, the United States has provided assistance amounting to 180 billion US dollars, including military aid worth 66.5 billion US dollars. U.S. weapon supplies account for 20 percent of all Ukrainian armaments, particularly long-range missiles from air defense artillery, namely Patriot missiles capable of shooting down Russian ballistic missiles.

Since the war against Russian aggression three years ago, Washington has been Kyiv's main supporter. However, since Trump returned to the White House and expressed his intention to end the war promptly, everything has gradually changed.

"Dependence on U.S. technical assistance has a greater impact than the cessation of arms shipments," said Malcolm Chalmers, Deputy Director-General of the RUSI research institute.

After reestablishing communication with Moscow, Trump began to reduce 'support' for Kyiv. So far, U.S. military aid has not only consisted of weaponry and ammunition.

Ukrainian forces rely on the Starlink communication system supplied by Elon Musk and U.S. intelligence information to track the movements of Russian forces and guide Ukrainian attacks. The cessation of satellite data and U.S. information would hinder Ukraine's offensive capabilities. Other Western allies have not yet been able to supply the necessary information.

"Dependence on U.S. technical assistance has a greater impact than the cessation of arms shipments," said Malcolm Chalmers, Deputy Director-General of the RUSI research institute.

Why did Trump cut aid? The White House stated that they would temporarily halt and evaluate aid to Ukraine. The U.S. wants to ensure that the policy will contribute to resolving the conflict.

Trump's directive was enforced until Ukraine demonstrated a commitment to negotiate with Russia. Trump made this decision after a dispute with Ukrainian President Volodymyr Zelenskyy at the White House on Friday (28/2/2025) last week. Trump and his deputy, JD Vance, accused Zelenskyy of being ungrateful, cornered, and lacking personnel to wage war.

Trump wants Zelenskyy to be more realistic about the current situation. So what aid is the US suspending now?

Trump ordered a halt to military assistance and weapons already approved and in the process of being delivered. The anonymous source said it was not clear what weapons were being halted or how many.

Since the beginning of the conflict, the US has supplied weapons and technical assistance through the PDA scheme, which is within the authority of the President and does not require US Congressional approval.

PDA is a rapid arms procurement scheme by order of the US President to a country. Armaments worth more than 20 billion US dollars were sent to Ukraine under the PDA scheme.

At the start of the Russo–Ukrainian War, the US had pledged and disbursed $65 billion in aid through the Presidential Drawdown Authority (PDA) and the Ukraine Security Assistance Initiative (USAI).

PDA is a rapid arms procurement scheme based on the US President's order for a country. Since the beginning of the war, more than $20 billion worth of weapons have been sent to Ukraine under the PDA scheme.

Ukraine is still awaiting a large supply of armored vehicles through the PDA scheme, which is scheduled to arrive in mid-2025. The fleet of armored vehicles is undergoing maintenance at a number of NATO military depots in Europe.

Meanwhile, the USAI Scheme is a $33.2 billion arms purchase from the US and allied countries. USAI funds were allocated by the US Congress as part of a long-term cooperation to arm Ukraine.

It took years to produce weapons and deliver them to Ukraine under the USAI scheme. Through this scheme, Ukraine received the latest weapons supplies while also generating profits for arms manufacturers. There are still 15 percent of weapons orders that have not been delivered under this scheme. Some of the remaining orders are rocket launchers and guided missiles.

The cessation of US military aid has not had a direct impact on the course of the battle, especially on the eastern front. Ukrainian troops are still holding out despite being pushed back by Russian attacks along a 1,000-kilometer front line.

The impact of Trump's policies on US arms factories is the cessation of ongoing orders, production plans, and investments of arms manufacturers such as L3Harris Technologies, Lockeeh Martin Corp, RTX Corp, and General Dynamics.

Several types of weapons approved under the Biden administration are affected by Trump's policies, but no further details were provided.

For example, $500 million in aid approved in January 2025 before President Joe Biden left office included air defense missiles, ammunition support systems and other equipment. All of that aid was subject to Trump's ban. Officials do not know how much of that aid has reached Ukraine and how much was affected by Trump's ban.

On the other hand, the termination of US military aid has not had a significant impact on the course of the battle. On the eastern front, along 1,000 kilometers, Ukrainian troops are still holding out despite being pushed back by Russian attacks. Russian troops continue to advance despite suffering heavy material and human losses.

Air Defense Gap

Although the US policy has not had a significant impact at this time, it is feared that the cessation of aid will weaken Ukraine's air defenses and its ability to hit Russian targets behind the lines.

A Russian military blogger, Alexander Kots, said the US aid cutoff was extremely unpleasant and could have deadly consequences in combat.

Western allies may be able to supply Ukraine with artillery, but they have no replacement for the HIMARS long-range air and missile defense system, which can reach targets within 300 kilometers.

Shmygal said US military assistance in the form of air defense artillery and intelligence had saved tens of thousands of Ukrainian lives.

Patrick Bury, a war expert at the University of Bath in the UK, said Ukraine is currently short of Patriot missiles and air defense systems that are badly needed to protect Ukrainian cities. "The supply of high-tech weapons from the US cannot be replaced by Western Europe," Bury said.

Ukraine itself has stockpiled munitions and artillery equipment and increased its domestic drone production capacity, which has been a mainstay in the Russo-Ukrainian War. It is estimated that half of the military equipment used by Ukraine is made domestically.

Chalmers, an expert at the RUSI institute, said Ukraine has increased its armaments and strategic industries. "The pressure of the situation makes them work hard to increase production. They can survive for a while," Chalmers said.

In a meeting in London, Sunday (2/3/2025), it was agreed that British aid of 2 billion US dollars would be used to finance the procurement of 5,000 air defense missiles. Meanwhile, the European Union discussed a proposal for aid of 841 million US dollars for Ukrainian air defense. The Director of the Center for Governance and Security at the Chatham House institution, England, said that US and European aid actually complement each other.

“Without US assistance there is something missing in the aid structure for Ukraine,” said Samir Puri.

Ukraine vows to fight on despite US President Donald Trump's halt to military aid. "We will fight to survive," Ukrainian Prime Minister Denys Shmygal told a news conference in Kyiv on Tuesday (3/4/2025).

The US has been a major supporter of Ukraine since the start of the Russian invasion in February 2022. Shmygal said US military assistance in the form of air defense artillery and intelligence has saved tens of thousands of Ukrainian lives.

Ukraine says it is in talks with Europe to fill arms supply gaps.

“We are negotiating with European partners and of course to renegotiate with the United States,” Ukrainian Presidential adviser Mykhailo Polodyak said in an X account.

Shmygal said Ukraine is eager to continue cooperation with the U.S., including the right for the U.S. to mine rare earth minerals in Ukraine, which failed to be agreed upon during Friday's chaotic Trump-Zelensky meeting at the White House.

President Trump stressed that the presence of large US mining businesses in Ukraine has become a security “umbrella” for Ukraine in the future.

So far Zelenskyy has not commented on the halt in US military aid.

Shmygal, meanwhile, underlined the importance of US military guarantees for Ukraine and Europe. “We need real security guarantees from the US and Europe and the G7 countries. This is very important for Ukraine and the European Union and the European continent,” Shmygal said.

Previously, President Trump emphasized that the presence of large US mining businesses in Ukraine has become a security “umbrella” for Ukraine in the future.

Trump seems to want the parties to be more active, and Washington to focus more on the national mission. Even at the White House, in a press conference, when asked by reporters about the German election this week, Trump replied that it was Germany's business. "We have a lot of our own things to do at home," Trump said followed by laughter from the audience. (AP/Reuters/AFP)