Now entering the third year of a war that has claimed hundreds of thousands of lives, the intelligence partnership between Washington and Kyiv is a linchpin of Ukraine’s ability to defend itself. The C.I.A. and other American intelligence agencies provide intelligence for targeted missile strikes, track Russian troop movements and help support spy networks.
But the partnership is no wartime creation, nor is Ukraine the only beneficiary.
It took root a decade ago, coming together in fits and starts under three very different U.S. presidents, pushed forward by key individuals who often took daring risks. It has transformed Ukraine, whose intelligence agencies were long seen as thoroughly compromised by Russia, into one of Washington’s most important intelligence partners against the Kremlin today.