Hossein Salami, second-in-command of the Revolutionary Guards, told Israel, "There is no way for you but the sea."
Foreign Minister Sergei Lavrov said Moscow warned the Americans of its "red lines."
The U.S. gained an ally in Baghdad after overthrowing Saddam Hussein in 2003, but an alliance of Iran, Iraq, Russia and Syria is growing stronger.
"There has been nobody tougher on Russia than President Donald Trump," said President Donald Trump.
Russia may arm the Assad regime with S-300 missile systems, a prospect that makes Israel nervous.
Iran is sending officials to Lebanon, Iraq and Syria as tensions mount with Israel, Saudi Arabia and the U.S.
Obama tried to sidestep crises, and Trump is allowing three autocratic governments to advance and a murderous dictatorship to survive.
Every day those 2,000 U.S. troops remain in Syria, we remain saddled with enormous strategic risk.
Naples Mayor Luigi de Magistris said his "City of Peace" was no place for nuclear weapons or nuclear-powered vessels.
Moscow's top diplomat accused the West of targeting the Russian public, not elites, with sanctions.
Syria celebrates 72 years of independence from France on April 17, 2018.
It's become clear that the targets were empty—and the attack was no more than a show.
U.S. ambassador to the United Nations Nikki Haley cautioned that chemical attacks similar to those in Syria "could happen" in the United States doesn't take more precautions domestically.
Unlike Trump, Obama initially turned to Congress to decide on whether to attack Syria.
Since 2001, the U.S. has been involved in several ongoing overseas conflicts with no clear end in sight.
The world's top two military powers may be on a collision course in Syria.
"The Russians met their match," said CIA Director Mike Pompeo, who has been nominated for secretary of state.
The Irbus Cossacks of St. Petersburg named him an honorary member when Trump became president.
"We hope the Trump administration thinks twice before deciding to attack Syria," the ruling Chinese Communist Party's newspaper said.
Defense Secretary James Mattis is heading to the White House to show President Donald Trump his options for attacking Syria.
How wonderful it would be if the fresh-faced French president could make amends for the self-serving 25-year French Mandate rule in Syria.