The Trump administration concluded that Assad was behind the act, and on Thursday ordered a cruise missile strike against a Syrian airbase as a "proportional response".
Russian President Vladimir Putin is considering reopening a vital battlefield communications node between his forces and US troops in Syria, which had been shuttered since Washington's strike on Syrian forces last week.
Mr Lavrov also said President Vladimir Putin is ready to return to implementing the memorandum of understanding on flight safety in Syria with the United States.
The deal was suspended after USA strikes against a Syrian airbase following last week's suspected chemical attack in Idlib province, in an act Moscow labelled "aggression against a sovereign state".
As a candidate and even in his first weeks in the White House, Trump expressed hope for better relations with Russian Federation. It was stark evidence that the president is moving ever further from his campaign promises to establish better ties with Moscow. The U.S. says the United Nations doesn't need action from the U.S.to investigate because there are already mechanisms in place to investigate chemical weapons use in Syria.
In an interview yesterday, Putin said that if Donald Trump had meant to bring about a thaw in U.S. relations with Russian Federation, he has failed to see this intention through.
Until the chemical attack, the Trump administration had sought to step back from the USA position that Assad should leave power.
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President Vladimir Putin said on Wednesday trust had eroded between the two countries under President Donald Trump, as Moscow delivered an unusually hostile reception to Secretary of State Rex Tillerson in a face-off over Syria.
Russian Federation has also denied a chemical weapons attack took place in Syria saying the deaths in Khan Sheikhoun were caused by a Syrian regime airstrike on a rebel-controlled chemical weapons factory on the ground.
US-based Human Rights Watch said the veto "tells those responsible for chemical attacks that they can flout the laws of war and attack civilians without consequences".
On Thursday, Trump adopted a more optimistic tone, saying on his Twitter account, "Things will work out fine between the United States of America and Russian Federation".
Trump later supported WikiLeaks founder Julian Assange's statements claiming that Russian Federation did not help WikiLeaks.
Tillerson's trip to Moscow represented the highest-level contact between the US and Russian Federation since Trump took office in January.
At least 84 people were killed.
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Some of the weapons on show included nuclear-capable missiles that have previously been successfully tested. The comments come after a failed missile test launch by North Korea, and a massive military parade.
Secretary of State Rex Tillerson led the charge, along with Defense Secretary James Mattis and UN Ambassador Nikki Haley.
"We believe it is fundamentally important not to let these actions happen again".
With tensions rising over Syria and other issues, President Donald Trump said on Wednesday that United States relations with Russian Federation "may be at an all-time low" as he moved ever further away from his campaign promises to establish better ties with Moscow.
Trump and others have indeed threatened similar action. "We have seen it all already".
Tillerson insisting - Syrian leader Bashar Al- Assad's days are numbered. But we might get some clarity about U.S. intentions.
"Even if we have them, we wouldn't use them, and we have never used our chemical arsenal in our history". You have encouraged us in our mission - to provide quality news and watchdog journalism. Subscriptions start as low as 25¢ per day.
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