US Secretary of State, Rex Tillerson has criticised Russia, saying it has failed to prevent Syria from carrying out a chemical attack on a rebel-held town. Mr. Tillerson said, Russia had agreed to ensure Syria's chemical weapons stockpiles were destroyed and its failure to do this enabled the attack.<br/><br/>The US fired 59 missiles at a Syrian airbase after the alleged attack. Syria has denied using any chemical agents, and Russia says the US gave no evidence Syria has chemical weapons. Mr Tillerson is set to meet his Russian counterpart, Sergei Lavrov, this week in Moscow.