Speaking in Bishkek, Kyrgyzstan, where Mr Putin was attending a collective defence meeting of former Soviet republics, his spokesman Dmitri Peskov said the USA had produced no evidence that Mr Al Assad was responsible for the April 4 attack in Idlib.
Discussing how to follow up and implement the agreements reached between Iran and Russian Federation during the visit of President Rouhani to Moscow was another part of the talks between Zarif and Lavrov.
This comes after consensus from USA and world leaders that his government forces were behind the attack.
More than 300,000 people have lost their lives and millions of people have been displaced since a peaceful uprising against Mr Assad six years ago turned into a full-scale civil war.
The immediate point of contention between Moscow and Washington is how an April 4 chemical weapons attack that killed more than 85 people and sickened hundreds in Syria occurred. Only through working to change the dynamic of the battlefield can the global community bring forth the conditions for a political solution.
Russian Federation said the gas was part of rebel stockpiles, which the rebels have denied.
Earlier this week, Turkish doctors also said that test results conducted on victims confirmed that sarin gas was used. With some American incentives, China would more than likely take whatever steps necessary to tame North Korea and prevent any confrontation between the U.S. and North Korea that could precipitate regional upheaval that China wants to avoid at any price.
British Foreign Secretary Boris Johnson said the veto "puts Russian Federation on the wrong side of the argument", while French President Francois Hollande warned Russian Federation it "bears a heavy responsibility" for continuing to protect Assad.
Russian Foreign Minister Sergey Lavrov (C) and Iranian Foreign Minister Mohammad Javad Zarif attend a joint press conference in Moscow, Russia, on April 14, 2017. In his Wednesday interview with AFP, Assad similarly said his nation would allow only an "impartial" investigation.
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On Tuesday morning a residential district in Chan Sheikhun in Idlib province was bombed and poison gas was released. "And Russia said no to a resolution that would have helped promote peace in Syria", Haley observed.
"Definitely, 100 percent for us, it's fabrication". However, he added that he believes Moscow and Washington have "great potential" to improve their relationship.
Following the event, the USA military struck a Syrian air base in response to a sarin gas attack on civilians last week.
Tillerson said, "We need to attempt to put an end to this steady degradation which is doing nothing to restore the trust between our two countries or to make progress on the issues of the greatest importance to both of us".
"I want to emphasize the extremely provocative role of the United States missile strike at the Shayrat airfield".
So that we can then address the more serious problems.
Putin discussed the general decline in U.S. Peskov also said Putin had given Tillerson his views on the situation in Syria, and how it was likely to develop.
He added that "this outrage is abetted by Russia's continuing efforts to bury the truth and protect the Syrian regime" form consequences of using chemical weapons. On the other, they claim that President Trump is a puppet of Russian President Vladimir Putin. "I think he had a very successful meeting in Russia", Trump said.
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