Patriots running out? Ukraine's $700,000 answer to Russia's missile factories.

Ukraine's US-supplied Patriot air defense systems are nearly depleted. Meanwhile, Russia produces about 100 of its deadliest ballistic missiles every month. Unable to intercept them all, Ukraine is trying a different approach: striking the factories where the missiles are built. Kyiv is also developing a cheaper alternative for defense — a homemade interceptor that costs about $700,000 each.