The Washington Post is reporting that President Obama received a highly classified “eyes only” letter in August detailing that Russian President Vladimir Putin was directly involved in a cyber campaign with the objective of defeating Democratic nominee Hillary Clinton and helping elect her opponent, now President Donald Trump. The Post investigation is based on interviews with current and former unnamed government officials. The report also chronicles President Obama’s attempts to punish Russia for the alleged interference in the U.S. election, including by imposing sanctions, expelling 35 Russian diplomats, closing two Russian compounds in the U.S., and a covert measure to plant cyberweapons in Russia’s infrastructure.