What are Patriot missile systems—the defence system Kyiv will receive in US military aid

US President Trump announced Ukraine will receive Patriot missile systems as part of a new American military aid package, welcomed by Kyiv amidst relentless Russian attacks. These systems, designed to intercept missiles and drones, are costly, with a single battery exceeding $1 billion. While Ukraine has already received six Patriot batteries, it needs more to adequately protect its vast territory.