As American officials began to realize that Russia was trying to sabotage the 2016 presidential election, the informant became one of the C.I.A.’s most important — and highly protected — assets. But when intelligence officials revealed the severity of Russia’s election interference with unusual detail later that year, the news media picked up on details about the C.I.A.’s Kremlin sources…

The informant, according to people familiar with the matter, was outside of Mr. Putin’s inner circle, but saw him regularly and had access to high-level Kremlin decision-making — easily making the source one of the agency’s most valuable assets…

The decision to extract the informant was driven “in part” because of concerns that Mr. Trump and his administration had mishandled delicate intelligence, CNN reported. But former intelligence officials said there was no public evidence that Mr. Trump directly endangered the source, and other current American officials insisted that media scrutiny of the agency’s sources alone was the impetus for the extraction.