As Mr. Trump emerged in spring 2016 as the improbable favorite for the Republican nomination, the Russian operation accelerated on three fronts — the hacking and leaking of Democratic documents; massive fraud on Facebook and Twitter; and outreach to Trump campaign associates.
Consider 10 days in March. On March 15 of that year, Mr. Trump won five primaries, closing in on his party’s nomination, and crowed that he had become “the biggest political story anywhere in the world.” That same day in Moscow, a veteran hacker named Ivan Yermakov, a Russian military intelligence officer working for a secret outfit called Unit 26165, began probing the computer network of the Democratic National Committee. In St. Petersburg, shift workers posted on Facebook and Twitter at a feverish pace, posing as Americans and following instructions to attack Mrs. Clinton.
On March 21 in Washington, Mr. Trump announced his foreign policy team, a group of fringe figures whose advocacy of warmer relations with Russia ran counter to Republican orthodoxy. Meanwhile, Unit 26165 was poring over the bounty from a separate attack it had just carried out: 50,000 emails stolen from the Clinton campaign’s chairman.
On March 24, one of the members of the Trump foreign policy team, George Papadopoulos, sat in the cafe of an upscale London hotel with a Russian woman who introduced herself as Mr. Putin’s niece and offered to help set up a meeting between the Russian president and Mr. Trump. The woman and the adviser exchanged frequent messages in the weeks that followed. Today, Mr. Padadopoulos is unsure that those messages came from the person he met in the cafe.
The Russian intervention was essentially a hijacking — of American companies like Facebook and Twitter; of American citizens’ feelings about immigration and race; of American journalists eager for scoops, however modest; of the naïve, or perhaps not so naïve, ambitions of Mr. Trump’s advisers. The Russian trolls, hackers and agents totaled barely 100, and their task was to steer millions of American voters. They knew it would take a village to sabotage an election.
Russians or suspected Russian agents — including oligarchs, diplomats, former military officers and shadowy intermediaries — had dozens of contacts during the campaign with Mr. Trump’s associates. They reached out through email, Facebook and Twitter. They sought introductions through trusted business connections of Mr. Trump’s, obscure academic institutions, veterans groups and the National Rifle Association.