Ukraine’s defense minister said Wednesday that Patriot air defense systems had arrived in the country.

Ukrainian officials long lobbied allies to provide the advanced weapons that are capable of shooting down enemy missiles and Ukrainian forces spent several months training in the United States and Europe to use the systems.

“Today, our beautiful Ukrainian sky becomes more secure because Patriot air defense systems have arrived in Ukraine,” Ukrainian Defense Minister Oleksii Reznikov tweeted. “Our air defenders have mastered them as fast as they could. And our partners have kept their word.”