U.S. intelligence cooperation with Ukraine has reportedly returned to its previous level as Kyiv continues carrying out medium- and long-range attacks against Russia’s oil infrastructure.

The CIA has maintained close ties with Ukrainian intelligence agencies since Russia’s invasion in 2014. What began primarily as a relationship focused on training and support has developed over the years into a broader two-way intelligence-sharing partnership, according to Forbes. However, the relationship faced a serious setback in February 2025 following a tense Oval Office meeting between U.S. President Donald Trump and Ukrainian President Volodymyr Zelenskyy. Washington subsequently suspended intelligence and weapons assistance to Kyiv for a period.

Sen. Mark Warner, D-Va., the ranking member of the Senate Intelligence Committee, said this month that the two countries have overcome many of the difficulties that previously strained their cooperation and have restored a robust intelligence relationship.

“I don’t want to get into any specifics, but it has improved,” Warner told Politico.

Over more than a decade, the CIA has invested millions of dollars in training and supporting Ukrainian intelligence personnel. According to ABC News, citing former U.S. officials, the agency also helped establish roughly a dozen covert forward bases near Ukraine’s border with Russia.

Warner indicated that the renewed cooperation has contributed to Ukraine’s growing battlefield advantage. Kyiv has increasingly used long-range drones and missiles to strike strategically important targets deep inside Russian territory, including facilities linked to the country’s oil sector.