Acting in response to the US' missile strikes on a Syrian regime airbase, a Russian military spokesperson said Moscow was closing a safety coordination channel with Washington.
"We view sanctions as being a very important tool", said treasury secretary, Steven Mnuchin.
The United States has conducted air strikes against Islamic State, which controls territory in eastern and northern Syria, and a small number of U.S. troops are helping rebel militias.
British Foreign Secretary Boris Johnson, meanwhile, canceled his planned Monday visit to Moscow, citing developments in Syria.
Near the central city of Homs, a bomb exploded aboard a bus carrying workers, killing a woman and wounding more than 20, according to state TV and the Observatory.
Russian Federation swiftly condemned last week's attack.
USA ambassador to the United Nations Nikki Haley said on Friday the Trump administration was ready to take further steps if needed.
Putin: US strikes against Syria are act of aggression against sovereign state.
Assad depends on Russian support to continue waging his war in Syria.
In a letter to Congress on Saturday, Trump said he "acted in the vital national security and foreign policy interests of the United States, pursuant to my constitutional authority to conduct foreign relations" and as commander in chief and chief executive.
Cautious reaction to Turkish election result from Greek leaders
Omer Celik defended what he said were Turkey's strong legal framework and transparent process for elections. Everyone and all sections - and the main opposition party in particular- must show respect.
Both governments have defended their Damascus ally against Western allegations that it carried out a chemical weapons attack on the rebel-held town of Khan Sheikhun on Tuesday, killing dozens of civilians.
"There's responsibility that goes around", Gabbard said, "Standing here pointing fingers does not accomplish peace for the Syrian people".
A United States military official told CNN the Pentagon was examining specifically whether a Russian warplane had bombed a hospital in Khan Sheikhoun five hours after the initial chemical attack, with the aim of destroying evidence.
United States allies from Asia, Europe and the Middle East expressed support for the attack, if sometimes cautiously.
Russian President Vladimir Putin denounced the United States strike as "act of aggression" and said it violated worldwide law.
US Ambassador to the United Nations Nikki Haley warned Friday that the United States "is prepared to do more" in response to Syria's use of chemical weapons and delivered a sharp rebuke to Russian Federation for its support of the Syrian regime.
"Don't you believe Bashar al-Assad bears any responsibility for the horrific deaths that have occurred in his own country?"
"But I will tell you the most humane thing that we can do is try to end the suffering within Syria".
"It is our hope that this will not be limited to the USA action", Erdogan said while speaking about responding to the Khan Shaykhun attack as well as the broader Syrian conflict.
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