UNITED NATIONS, United States: Russia Tuesday vetoed a U.S.-drafted resolution that would have extended for a year the mandate of a panel investigating who is behind chemical weapons attacks in Syria.

It was the ninth time Russia has used its veto power at the Security Council to block action targeting its Syrian ally.

Russia opposed renewing the mandate of the joint U.N.-Organisation for the Prohibition of Chemical Weapons (OPCW) panel before the commission releases a report on a sarin gas attack in Khan Sheikhun, which is expected Thursday.

The United States, France and Britain have accused President Bashar Assad's forces of carrying out the April 4 attack on the opposition-held village, killing scores of people including children.

Following the Russian veto, U.S. Ambassador Nikki Haley accused Moscow of "once again" siding "with the dictators and terrorists who use these weapons."

"Russia has once again demonstrated it will do whatever it takes to ensure the barbaric Assad regime never faces consequences for its continued use of chemicals as weapons," Haley said in a statement.

"By rejecting the renewal of the work of the Joint Investigative Mechanism (JIM) - an independent, purely technical body - Russia has made it clear that it does not care about stopping the use of chemical weapons in the world."

Russia failed at the opening of the meeting to garner enough support for a measure that would have delayed the vote until next month. The JIM's mandate ends on November 17.

China and Kazakhstan abstained, while Bolivia voted against the renewal and 11 other countries backed extending the mandate. Russia used its veto to block the adoption.

A resolution requires nine votes to be adopted at the council, but five countries -- Russia, Britain, China, France and the United States -- can block adoption with their veto power.

Russian Ambassador Vasily Nebenzia accused the United States and its partners of seeking a vote on the measure "to show up and dishonor Russia."

"What is taking place today is not very pleasant," said Nebenzia. "It stinks, in fact."

The ambassador renewed his criticism of the panel, saying its methodology and "the lack of evidence" in the Khan Sheikhun investigation was "laughable."

Last month, UN war crimes investigators said they had evidence that the Syrian air force was behind the Khan Sheikhun attack, despite repeated denials from Damascus.

More than 87 people died in Khan Sheikhun, drawing global outrage and prompting the United States to fire cruise missiles at a Syrian airbase from which the West says the attack was launched.

Russia maintains that the sarin attack was most likely caused by a bomb set off directly on the ground, not by a Syrian air strike as alleged by the West.

While the OPCW has established that sarin was used in the April attack, it does not have the mandate to assign blame for the attack, leaving that determination to the JIM.

The JIM has already concluded that Syrian government forces were responsible for chlorine attacks on three villages in 2014 and 2015, and that Islamic State jihadist group used mustard gas in 2015.

In February, a resolution put forward by the United States, Britain and France to impose sanctions on Syrian officials who were allegedly involved in those chlorine attacks was vetoed by Russia and China.