WASHINGTON, Dec. 29 - President Barack Obama on Thursday ordered the expulsion of 35 Russian suspected spies and imposed sanctions on two Russian intelligence agencies over their involvement in hacking U.S. political groups in the 2016 presidential election, Reuters reported.

The measures, taken during the last days of Obama's presidency, mark a new post-Cold War low in U.S.-Russian ties and set up a potential flashpoint between incoming President-elect Donald Trump and fellow Republicans in Congress over how to deal with Moscow.