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.

"We’ve already sent some, we will send more now that we have additional authority and money,” White House national security adviser Jake Sullivan said. The additional ATACMS were included in a new military aid package signed by President Joe Biden on Wednesday.

Biden approved delivery of the long-range Army Tactical Missile System, known as ATACMS, in February, and then in March the U.S. included a “significant” number of them in a $300 million aid package announced, officials said.

U.S. officials would not provide the exact number of missiles given last month or in the latest aid package, which totals about $1 billion.