Despite intense global pressure, Syrian President Bashar al-Assad has clung to power since a civil war broke out in his country six years ago, helped by financial and military support from both Russian Federation and Iran.
The move was in response to a suspected chemical weapons attack on the rebel-held town of Khan Sheikhun earlier in the week which killed at least 86 people according to the Syrian Observatory for Human Rights. Officials said a drone belonging to either Russian Federation or Syria was seen hovering over the site after the assault earlier this week.
Mr Johnson was due to visit Russian Federation on Monday for talks with Mr Lavrov, which would have been the first visit to the country by a British foreign secretary in more than five years.
The decision to strike in Syria marked a stark reversal for Trump, who during his presidential campaign faulted past USA leaders for getting embroiled in conflicts in the Middle East.
He said that for that "this oppressive Assad needs to go".
Russian Federation will suspend cooperation with the Pentagon over a Syrian air space agreement as a result of the strikes, he said.
US Secretary of State Rex Tillerson will visit Moscow as planned after the G7 meeting in Italy this week.
The US missile strikes on the Syrian airbase drew support from many nations, including United Kingdom, Canada and Australia.
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Iran and Russian Federation are Assad's closest allies, and label all opponents of his regime as "terrorists".
Other than that, he added, "there is no change to our military posture" towards Syria.
"Tonight I ordered a targeted military strike on the airfield in Syria from where the chemical attack was launched", Trump told reporters Thursday night at his Florida club, where he hosted Chinese President Xi Jinping earlier in the evening.
Though Russia has denied all the reports of the chemical attack as a "factual misinformation" and claimed that the gas might have leaked from the rebels' own chemical weapons depot, its military has, at the same time, announced that it would bolster and increase the effectiveness of Assad's air defenses.
Haley said the USA was prepared to take further action in Syria but hoped it wouldn't be necessary. Trump's response was an implied (and often explicit) rebuke to President Obama's decision not to enforce the red line in Syria back in 2013. In no way do we see peace in that area with Assad as the head of the Syrian government. Mevlut Cavusoglu said Saturday that the US intervention was only "cosmetic" unless it removes Assad from power. Syria's six-year civil war has only become more complex in recent years. "And we're not going to allow things like this to happen to innocent people, '" Haley said.
Safronkov, the Russian diplomat, said he'd been "very frank" in consultations with US officials.
The Local Coordination Committees, another monitoring group, said the airstrike was carried out by Russian warplane.