Some stocked up on food and prepared underground shelters while others taunted the US president to go through with his threats.
Clarion Project National Security Analyst Ryan Mauro on President Trump's policy on Syria and Rep. Devin Nunes' calls to impeach FBI Director Christopher Wray and Deputy Attorney General Rod Rosenstein.
The United States and its allies are considering whether to hit Syria over a suspected poison gas attack that medical relief organisations say killed dozens of people in the rebel-held town of Douma near Damascus on Saturday.
World Health Organization also cited reports about the deaths of more than 70 people who sheltered in basements, saying 43 of those people who died had shown "symptoms consistent with exposure to highly toxic chemicals".
The Syrian government said its invitation to the worldwide chemical weapons watchdog to send a fact-finding mission to the country is "proof" that Damascus is innocent and has not used chemical weapons.
"They have threatened us a thousand times".
Russian Federation and the U.S. blocked attempts by each other in the United Nations Security Council on Tuesday to set up worldwide investigations into chemical weapons attacks in Syria.
The Syrian pound lost almost 10 percent of its value on prospects of an American attack, going from about 430 Syrian pounds to the dollar last week to 469 Wednesday.
Last year's USA attack was limited to 59 Tomahawk cruise missiles aimed at destroying Syrian warplanes.
"We'll be working with our closest allies to consider how we can ensure that those responsible are held to account", she told reporters.
The Kremlin said on Wednesday it hoped all sides involved in Syria would avoid doing anything that could destabilise an already fragile situation in the Middle East, and made clear it strongly opposed any US strike on its ally.
US officials tell The Associated Press that the allies have weighed launching a military strike as early as the end of this week.
The Pentagon said it would not comment on potential future military operations.
At least 43 people were killed and more than 500 needed treatment over the suspected nevere agent gas attack on the rebel enclave in Eastern Ghouta.
Scott Murray, a retired Air Force colonel who oversaw the targeting of Islamic State militants in Syria, said those air defenses nearly assured a missile attack from the sea. The state news media in Syria denied that the government had used chemical weapons, and accused a rebel group of fabricating the videos to drum up global support.
"In the event of a threat to our military servicemen's lives, Russia's Armed Forces will take retaliatory measures to target both the missiles and their delivery vehicles", Gerasimov said, state-run media TASS News Agency reported.