Since 2001, the U.S. has been involved in several ongoing overseas conflicts with no clear end in sight.
President Trump could decide whether to attack Syria as soon as "later today," a move that could draw a Russian military response.
Russia's top diplomat argued that U.S. military presence in Syria was illegal and rebutted accusations over the poisoning of an ex-Soviet spy.
At least 20 countries expelled 139 suspected Russian spies in solidarity with the United Kingdom.
Russian Foreign Minister Sergey Lavrov warned that Moscow "made it clear" the U.S. would not be allowed to attack the Syrian military.
Russia said the U.S. may risk "opening a Pandora's box" if it takes their military rivalry to outer space.
Russian Foreign Minister Sergey Lavrov says Moscow will "soon" expel British diplomats in a tit-for-tat response.
Russia's Ministry of Foreign Affairs has called out Heather Nauert for ridiculing Moscow's bombardment in Syria.
Russia and China have tried to mediate in the nuclear crisis between the U.S. and North Korea in an attempt to avoid an all-out nuclear war.
Russian Foreign Minister Sergey Lavrov had harsh words for the U.S. and called new talks in Canada "harmful."
The U.S. and Russia have traded tit-for-tat diplomatic sanctions since the fallout around the 2016 election.
Moscow's top diplomat joked that Russia had a "tough year" interfering in every election in the world, regrets it so far failed to topple the Japanese emperor.
Russian Foreign Minister Sergey Lavrov said his country is willing to help with arrangements.
Moscow blamed former President Barack Obama for souring the U.S. relationship with Russia just before he left office.
A CNN reporter tweeted that he could only distribute pictures taken by Russia because press were not admitted.
Russian Foreign Minister Sergey Lavrov laughed off a question about the firing of FBI Director James Comey.
Moscow called tough U.S. talk and action on the Syrian regime "flexing muscles" and "baring teeth."
Only 14 percent of Russians support their military's involvement in Syria.
Russia maintains its airstrikes are targeting ISIS locations.
The Syrian opposition says airstrikes in Homs killed 36 civilians.