The Assad regime has carried out 174 chemical weapons attacks since its attack in East Ghouta near Damascus that left hundreds dead, according to a London-based rights watchdog.

Axar.az reports citing AA that, in a Monday report -- released on the fourth anniversary of the East Ghouta attack -- the Syrian Network for Human Rights (SNHR) stated that the Assad regime had carried out a total of 207 chemical attacks since the first one in Homs’ Al-Bayyada district on Dec. 23, 2012.

The SNHR also recalled April’s chemical attack on Khan Sheikhun, in which around 100 civilians in the opposition-held village were killed.

The NGO went on to assert that the international community, including the U.S., had failed to prevent the Assad regime from carrying out chemical weapons attacks or confiscate its arsenal of chemical arms.

According to Monday’s report, the regime carried out at least five more chemical attacks since April’s attack on Khan Sheikhun.

“Over the course of the six-year Syria crisis, Russia and China have used their veto right seven times in favor of the Syrian regime, which has hamstrung the UN Security Council and stopped it from safeguarding international law and order,” the report states.

On Aug. 21, 2013, more than 1,400 civilians were killed and more than 10,000 injured -- including women and children -- in the chemical attack on East Ghouta.

In September of the same year, the Syrian regime signed on to a chemical weapons convention, but this did not prevent it from carrying out additional chemical attacks.