Iran's missile threat to Europe is exemplified by its recent attempted strike on the Diego Garcia military base, highlighting the potential for Iranian ballistic missiles to reach major European cities. This situation is critical as it alters the security landscape for NATO allies and raises concerns about the safety of European capitals, including London, Paris, and Berlin. The mechanism behind this threat involves Iran's development and deployment of long-range missiles, such as the Khorramshahr-4, which are capable of traveling significant distances. Estimates suggest these missiles could target locations over 2,400 miles away, making them a viable threat to various strategic points across Europe, including military installations in southern and eastern Europe. The attempted missile launch at Diego Garcia, although unsuccessful, marks a notable escalation in Iran's military capabilities and intentions. Addressing Iran's missile threat offers several key benefits. Enhanced security cooperation among European nations can lead to improved collective defense strategies against such missile threats. Additionally, increased intelligence sharing among allies can help anticipate potential risks, while strengthening military defenses can deter future aggressions. The implications of this threat extend beyond immediate security concerns, as they may influence geopolitical dynamics in the Middle East and Europe. However, there are limitations to current missile defense strategies. Interception challenges remain, as evidenced by the failed attempts to hit Diego Garcia, which could undermine confidence in defense systems. Historical examples of missile defense failures further illustrate the vulnerabilities present in existing military responses, emphasizing the need for ongoing innovation in defense technologies and strategies.