Answer: Switzerland
Notes: Switzerland has joined the European Sky Shield Initiative (ESSI). ESSI was founded in 2022 after Russia's invasion of Ukraine and is led by Germany. The initiative aims to strengthen Europe's defence against air strikes and enhance NATO's integrated air and missile defence system. ESSI has 21 member states, including the UK. Its key component is the Arrow 3 missile defence system, an Israeli-American technology designed to intercept long-range ballistic missiles.
