WASHINGTON, D.C. — The United States and Ukraine are jointly working to modernize Soviet-era S-300 surface-to-air missiles and develop an improved variant to strengthen Ukraine's air defense capabilities. According to Robert Hamilton, a retired U.S. Army colonel and president of the Delphi Global Research Center, the upgraded system is expected to become operational closer to the end of 2026.
Speaking in an interview with PBS NewsHour, Hamilton said the project focuses on upgrading older S-300 interceptor missiles or developing a newer version with improved capabilities. He said production is expected to reach approximately 100 to a couple of hundred interceptor missiles annually once the program is underway.
The initiative is part of a broader effort by the United States and Ukraine to sustain Ukraine's existing Soviet-era air defense systems while increasing the availability of interceptor missiles for launchers that remain in service.
Program Builds on Earlier U.S. Commitment
The modernization effort follows an announcement made in September 2024 during a meeting of the Ukraine Defense Contact Group at Ramstein Air Base, Germany.
At the meeting, then-U.S. Secretary of Defense Lloyd Austin said the United States, working with several European companies, was helping Ukraine design and manufacture a replacement for the Soviet-era S-300 surface-to-air missile system as well as the R-27 air-to-air missile.
Austin did not provide technical details about the replacement system or its expected capabilities.
Supporting Existing Air Defense Systems
At the beginning of Russia's full-scale invasion, Ukraine operated an estimated 25 to 30 S-300PT and S-300PS battalions in varying states of combat readiness. During more than four years of war, continuous Russian missile and drone attacks significantly reduced Ukraine's stockpile of S-300 interceptor missiles.
As a result, Ukraine has increasingly relied on Western-supplied air defense systems and their interceptor missiles to defend against aerial attacks.
The joint U.S.-Ukraine effort is intended to increase the availability of interceptor missiles for the S-300 systems that remain in Ukrainian service while supporting the long-term operation of these launchers.
Localization Efforts in Ukraine
Alongside the joint modernization program, Ukraine's defense industry has been working to localize the production of missiles for the S-300 and S-400 systems.
According to earlier reports, this work includes integrating the missiles with European radar systems. Fire Point chief designer Denys Stielerman previously described efforts to develop components for these missiles, including plans for engine production and dynamic testing.
These localization efforts are aimed at expanding domestic production capability and supporting the continued operation of existing air defense systems.
Norwegian Funding Supports Missile Procurement
The modernization program has also received financial support from European partners.
In December 2025, the Norwegian government allocated more than 500 million Norwegian kroner for the procurement of S-300 surface-to-air missiles for Ukraine as part of its military assistance package.
The funding was provided through the Joint Ukraine Multinational Program Services, Training, and Articles Rapid Timeline (JUMPSTART), a U.S.-run defense procurement mechanism designed to help partner countries rapidly purchase and transfer military equipment to Ukraine.
Norway's broader assistance package also included funding for ammunition for F-16 fighter aircraft and advanced precision weapon systems.
Part of Broader Air Defense Effort
Hamilton said the S-300 modernization project is one of several measures aimed at addressing Ukraine's air defense requirements. He noted that the effort complements other air defense systems, including the French-Italian SAMP/T.
While planned production of approximately 100 to a couple of hundred interceptor missiles per year remains limited compared with Ukraine's overall demand, the joint program is intended to improve the availability of missiles for existing S-300 launchers and strengthen the country's air defense network.
According to Hamilton, the upgraded S-300 system is expected to reach operational status closer to the end of 2026, marking an important step in the ongoing cooperation between the United States and Ukraine to sustain and modernize Ukraine's air defense capabilities.
——— End of Article ———
