The Obama administration plans to announce on Thursday a series of retaliatory measures against Russia for hacking into U.S. political institutions and individuals and leaking information in an effort to help President-elect Donald Trump and other Republican candidates, two U.S. officials said on Wednesday. Both officials declined to specify what actions President Barack Obama has approved, but said targeted economic sanctions, indictments, leaking information to embarrass Russian officials or oligarchs, and restrictions on Russian diplomats in the United States are among steps that have been discussed.