Julian E. Barnes and Matthew Rosenberg
To determine what the Russian government is up to, the United States employs multiple forms of intelligence, including intercepted communications and penetrated computer networks.
The United States continues to intercept Russian communication, and the flow of that intelligence remains strong, said current and former officials. And Russian informants could still meet their C.I.A. handlers outside Russia, further from Moscow’s counterintelligence apparatus.
Spies and informants overseas also give American intelligence agencies early warning about influence campaigns, interference operations or other attempts to compromise the United States.
The spy agency does not believe its Russia informants have been killed, but sources have gone largely dormant amid heightened scrutiny and rising threats.
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