The Kiel Institute has reported a notable decline in military aid to Ukraine in 2025, with expenditures totaling €36 billion, which is 14% less than the €41.1 billion allocated in 2024. This reduction is largely attributed to decreasing support from the United States, which provided about half of all military assistance to Ukraine between 2022-2024. With the potential restoration of Donald Trump to the White House in 2025, U.S. aid is expected to come to a halt, prompting concerns about the sustainability of Ukraine's defense efforts.

In response to the diminishing support from the U.S., European nations have made significant efforts to compensate by increasing their military aid. In 2025, they raised their overall military assistance by 67% compared to the average from 2022 to 2024. This highlights a shift in the reliance on American military support to a more collaborative European effort to assist Ukraine amid ongoing conflict with Russia.

The Kiel Institute emphasizes that without the substantial commitment from European countries, Ukraine could face dire consequences from the decrease in U.S. support. The dynamics of international military aid are crucial for Ukraine's ongoing defense strategy, especially in light of the geopolitical challenges posed by Russia since the invasion in February 2022.