By CHRISTINA A. CASSIDY Associated Press
It's been more than three years since Russia's sweeping and systematic effort to interfere in U.S. elections through disinformation on social media, stolen campaign emails and attacks on voting systems. U.S. officials have made advances in trying to prevent similar attacks from undermining the 2020 vote, but the potential threats have increased and some old problems have not been addressed. A look at what has changed since 2016 and what has not.
THEN: U.S. intelligence agencies say Russia was the only nation that significantly interfered in the 2016 election. Russia's activities shouldn't have come as a surprise. Russia is believed to have interfered in Ukraine's 2014 vote. Russia's 2016 goals, according to an assessment by the U.S.