"We can not allow the use of chemical weapons to become normalized - within Syria, on the streets of the United Kingdom, or anywhere else in our world", she said.
In February, the British foreign office officially put on the Russian government responsible for a massive cyber attack using a virus-the extortioner NotPetya that they gave in June a year ago, hundreds of thousands of computers around the world.
The Syrian Observatory for Human Rights said a scientific research center and military bases in Damascus were struck in the attack. United States ambassador Nikki Haley said to the BBC that the United States has "enough proof" that Syria was behind the chemical attack.
"We did have some surface-to-air missile activity from the Syrian regime", General and Joint Chiefs of Staff Chairman Joseph Dunford said at a Pentagon briefing.
"And what's most important is no one contests that the use of chemical weapons can not be tolerated and must be deterred, " he said. Britain says Russian Federation is behind the Salisbury poisoning, a charge Moscow denies.
At the meeting, the fifth in a week on chemical weapons in Syria, Russia and its supporters again clashed with the USA and its allies over a suspected poison gas attack on April 7 in the Damascus suburb of Douma.
A fact-finding mission from the Organization for the Prohibition of Chemical Weapons is expected to arrive in Douma on Saturday.
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Trump had also said last week that Putin bore responsibility for the "atrocity" in Douma.
"The attack is the blatant violation of global laws, as well as ignoring the sovereignty and territorial integrity of Syria", Iranian Foreign Ministry spokesman Bahram Qasemi said according to Iranian state media. The strikes were condemned by Russian Federation.
"We welcome this operation which has eased humanity's conscience in the face of the attack in Douma, largely suspected to have been carried out by the regime", Turkey's Foreign Ministry said in a statement.
During a week of tense sabre-rattling, Russian officials periodically warned the United States that a military response may spiral out of control to war.
The Elysee palace said in a statement that Macron had also expressed regret about Russia's use of its Security Council veto on the attack. "We did not do any coordination with the Russians on the strikes nor did we prenotify them".
President Donald Trump ordered targeted military action in the country, following an alleged chemical weapons attack that reportedly left dozens of citizens dead.
Russian Federation accused Washington of putting worldwide peace at risk and requested a United Nations meeting in NY later in the day but it was not confirmed that it will happen.