Ukraine for the first time has begun using long-range ballistic missiles provided secretly by the United States, bombing a Russian military airfield in Crimea last week and Russian forces in another occupied area overnight, American officials said Wednesday.

Long sought by Ukrainian leaders, the new missiles give Ukraine nearly double the striking distance — up to 300 kilometers (190 miles) — that it had with the mid-range version of the weapon that it received from the U.S. last October.