The delays affect several countries in the Baltics and Scandinavia and involve arms bought through the US Foreign Military Sales program, which President Donald Trump has encouraged European NATO members to use more heavily. European officials say the setbacks complicate defense planning, especially for states near Russia, and reinforce concerns about dependence on US supply chains. Washington argues the weapons are needed in the Middle East, where Iran’s missile and drone attacks have increased demand for air defense munitions such as Patriot interceptors, which Ukraine also depends on.