World leaders have called for an international probe into the deadly chemical attack in Syria
Mr Johnson accused Russia of neglecting its “responsibilities” as a global superpower – and serving as a “lifeline” after Vladimir Putin used Russia’s veto to block the United Nations Security Council’s resolution to condemn the sarin gas attack.
In a searing attack on the Russian attempt to strong-arm the west over Syria, Mr Johnson claimed Moscow was on “the wrong side of the argument”.
He said: “This afternoon in New York, the international community sought to make clear that any use of chemical weapons by anyone anywhere is unacceptable and that those responsible will face consequences.
Mr Johnson claimed Moscow was on 'the wrong side of the argument'
"So I am dismayed that Russia has once again blocked the UN Security Council and in so doing refused to condemn the use of chemical weapons or support a full UN investigation into the attack.
"This puts Russia on the wrong side of the argument."
"So Russia faces a choice.
“It can continue acting as a lifeline for Assad's murderous regime, or it could live up to its responsibilities as a global power, and use its influence over the regime to bring six long years of failed ceasefires and false dawns to an end."
Russia used its veto for the seventh time during Syria's six-year-old civil war
World leaders have called for an international probe into the deadly chemical attack in Khan Sheikhoun last week, which caused an international outcry and prompted a retaliatory US missile strike.
But Russia used its veto for the seventh time during Syria's six-year-old civil war to shield president Assad's government.
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The vote came after US Secretary of State Rex Tillerson met Moscow’s Minister of Foreign Affairs Sergey Lavrov to discuss the escalating tensions in Syria – and the standoff between Russia nd and US diplomacy.
The strike on Khan Sheikhoun caused international condemnation
Surrounding tensions leaked into the diplomatic discussions with the Russian politician branding the American cruise missile strike "illegal" and criticising "confusing and sometimes openly contradictory ideas" from the Trump administration on the US-Russia relationship and international issues.
Mr Tillerson said there was "a low level of trust" between the former cold war rivals.
He added: "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 greatest importance to both of us."