What are “S-300 Clone” and GAM-67 in America’s new $2.68 billion package for Ukraine? Experts think they have answer

The US is preparing to sell Ukraine something unusual: American-made missiles for its Soviet S-300 air-defense systems. The missiles, labeled "S-300 Clone" in the paperwork, are part of a $2.68 billion package that the State Department approved on 18 September, financed by European partners and unused US military aid, Defense Express reports.

Ukraine has plenty of Soviet-era S-300 launchers but not the missiles to feed them. Russia will not sell more, and an earlier Ukrainian attempt to build its own went nowhere, according to Defense Mirror.

Not a Soviet 5V55 replica

At the same time, the missile itself is not actually a "clone" or replica of the Soviet 5V55. According to Defense Express's own information, this is a new development with enhanced characteristics and a different, more modern targeting guidance principle.

At the same time, the American side did not disclose the index, characteristics, or manufacturer of the missiles mentioned in the State Department's statement.

In September 2024, then-US Defense Secretary Lloyd Austin announced at the Ramstein contact group that Washington, in partnership with several European companies, was working with Ukraine to "design and build a substitute" for the Soviet S-300 and the R-27 air-to-air missile used by fighter jets, Newsweek reports. He never spelled out what that substitute would be.

Anti-radar missile project from the 1950s

The package will also include GAM-67. As for the GAM-67, despite the existence of an unrealized American anti-radar missile project from the 1950s, this is also a new development. It is intended for medium-range systems, both existing ones, including Soviet ones, and future ones.

The package also provides for modernization and maintenance: spare parts, consumables, and accessories, support during repair and return, software, transportation support, engineering, technical, and logistical services from the US government and contractors, and other related elements of logistical and program support.