Secretary of State Mike Pompeo acknowledged who was behind the cyber attack on Friday, saying Russia used third-party software to get inside the systems of multiple U.S. government agencies.But the attack didn't happen last week. It started in March. To help make sense of how an attack of this magnitude went undiscovered for months, NPR's Mary Louise Kelly spoke with Fiona Hill, who served as President Trump's most senior Russia adviser on the National Security Council until last year.Now that it's clear who was behind the attack, how do deal with Russia will be a big question for the incoming Biden administration. NPR's Russia correspondent Lucian Kim explains how the U.S.-Russia relationship may change as Biden takes office in January.In participating regions, you'll also hear a local news segment that will help you make sense of what's going on in your community.Email us at considerthis@npr.org.