At the United Nations on Friday, Russia's deputy ambassador, Vladimir Safronkov, strongly criticized what he called the U.S.
On Thursday night, the United States launched 59 Tomahawk cruise missiles at the military airfield in Ash Sha'irat. "From now on we will respond with force to any aggressor or any breach of red lines from whoever it is and America knows our ability to respond well", officials from Russia, Iran and pro-Assad militias said in a statement on Sunday.
Trump said he was sending the letter as part of his efforts "to keep the Congress fully informed, consistent with the War Powers Resolution".
The US stepped up the pressure on Sunday on Russian Federation to rein in the Syrian government, warning that any further chemical attacks would be "very damaging" to their relationship and suggesting any peace deal would be hard with Assad in power.
Defence Secretary Sir Michael Fallon said the Government had been in "close contact" with the USA administration in the run-up to the strike.
Noting that investigations have confirmed that "the Syrian regime has used chemical weapons against its own people multiple times" in the past, she said that Russian Federation "bears considerable responsibility" for Assad's use of chemical weapons.
Mr Tillerson will still go ahead with a visit to Moscow to deliver a "clear and co-ordinated" message to the Russians, Mr Johnson said. "That choice is to stick like glue to the Assad regime - that toxic regime which poisons its own people and is indeed poisoning the reputation of Russian Federation - or to work with the rest of world to find a political solution", he said. The strike was the first time American forces targeted a Syrian government installation in the course of the war.
Even so, allies of Mr Johnson admitted it would be "a battle" to get any agreement over the two days of talks following worldwide amazement at President Trump's decision to bombard a Syrian air force base in retaliation at the use of banned chemical weapons.
Putin: US strikes against Syria are act of aggression against sovereign state.
Tillerson enraged Moscow by asking if it was possible Russian Federation did not know about Syria's chemical arms, and called on the country to fulfil the obligation it made to the global community to guarantee the elimination of the weapons.
Although Russia has steadfastly supported Syrian President Bashar Assad's government, and they've coordinated military attacks together, Washington has never previously accused Moscow of complicity in any attack that involved the gassing of innocent civilians, including children. Assad accused the US of trying to boost the morale of "terror groups" in Syria.
US Secretary of State Tillerson is due to arrive in Moscow on Tuesday for two days of talks.
People attend a protest against American missile strikes in Syria, in front of the United Nations building in Damascus, Syria, on Saturday.