French President Emmanuel Macron declared that France has proof that Syria used chemical weapons against its own people in Douma on April 7. It was not immediately clear whether that visit would delay or avert US or allied military action.
A commander in the regional military alliance that backs President Bashar al-Assad said sites hit also included an air base west of Damascus near the Lebanese border.
US, British and French air strikes on Syria are a violation of worldwide law and are likely meant to prevent investigators from the global chemical weapons watchdog from doing their work, a senior Russian lawmaker was quoted by Interfax as saying on Saturday.
Although the United States and Russian Federation have imposed economic sanctions on each other since 2014, several large US corporations, including PepsiCo Inc and McDonald's Corp, still count Russian Federation as a growth market.
Following an invitation from Damascus, inspectors from the Organization for the Prohibition of Chemical Weapons (OPCW) are expected to arrive in Syria over the weekend to investigate the reported attack.
Speaking before Russia's lower house of parliament, Medvedev said the new sanctions were an attempt to capture global markets for USA companies.
In case of escalation, Russian Federation could use air bases of its ally Iran to deploy more aircraft closer to Syria.
The US and France have said they have proof it took place, and, alongside the United Kingdom, they are considering launching military retaliation against Syria.
"We're rapidly reaching an understanding of what happened on the ground", she told reporters.
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Turkish President Recep Tayyip Erdogan says he has urged calm and efforts to restitute peace in Syria during separate calls this week with U.S. President Donald Trump and Russia's President Vladimir Putin.
The Russian defence ministry and the Kremlin have yet to make any comment on the strikes announced by US President Donald Trump.
The Syrian government and Russian forces in Syria possess truck-mounted surface-to-air missile and anti-aircraft artillery weapons systems.
"Russia was supposed to guarantee that Assad wouldn't use chemical weapons and Russian Federation did the opposite".
Asked if he meant war between the United States and Russian Federation, he said: "We can not exclude any possibilities unfortunately".
In Moscow, the head of a Russian parliamentary defence committee, Vladimir Shamanov, said Russia was in direct contact with the U.S. Joint Chiefs of Staff about the situation.
"I don't want to talk about a specific attack that is not yet in the offing. We warned that such actions will not be left without consequences", Antonov said.
Publicly listed US companies generated more than $90 billion in revenue from Russian Federation in 2017, according to the Thomson Reuters Country of Risk model, which estimates companies' financial exposure to different countries.
Under a 2013 agreement for which Russian Federation was a guarantor, Syria was to have eliminated all its chemical weapons, but it has used chlorine and perhaps other chemicals since then.