Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) Syrian President Bashar al-Assad has dismissed reports of last week's chemical attack as "100% fabrication," an assertion at odds with numerous eyewitness accounts, independent analysis and even the explanation given by its strongest ally, Russia. In an interview with the AFP news agency, conducted under restrictions imposed by the Syrian government at the presidential palace in Damascus, Assad claimed the reported details of what happened were not credible because their source was al-Qaeda's former affiliate in Syria, Nusra Front. He suggested that photographs showing children who had died in the attack on a rebel-held town in Idlib province, which provoked revulsion around the world, were staged. The entire incident was "fabricated" and "unconvincing," Assad claimed.Bashar al-Assad: "We have never used our chemical arsenal in our history"Assertions contradicted by eyewitness accounts and independent analysis 
 Question:Even _'s staunch ally, Russia, accepts that the deaths were caused by chemical weapons.

Assad