The United Nations Security Council recently held a vote concerning punishing Syria for its illegal use of chemical weapons at the beginning of the civil war. While the United States voted in favor, along with France, the UK, and the majority of the Security Council, Russia and China both vetoed the resolution. Because of the vetoes, the resolution did not pass so Syria will not experience any consequences.
When Syria first used chemical weapons against its people years ago, the US and Russia together pressured Assad to sign the chemical weapons treaty and dismantle the Syrian stockpiles. Since Syria signed this and it includes consequences for breaking the treaty, it should not be a question of if Syria should experience consequences for using chemical weapons. With Russia and the U.S. arguing about it, it becomes a much more political discussion rather than holding the Syrian government responsible for crimes it committed against its own people.