The UN is having samples from Syria tested. France and Germany presented evidence Assad did it.

[freshwest]

23. Putin: Russia might let U.N. OK strike against Syria

AP/ September 4, 2013

NOVO-OGARYOVO, Russia President Vladimir Putin warned the West against taking one-sided action in Syria but also said Russia "doesn't exclude" supporting a U.N. resolution on punitive military strikes if it is proven that Damascus used poison gas on its own people.

In a wide-ranging interview with The Associated Press and Russia's state Channel 1 television, Putin said Moscow has provided some components of the S-300 air defense missile system to Syria but has frozen further shipments. He suggested that Russia may sell the potent missile systems elsewhere if Western nations attack Syria without U.N. Security Council backing...

"If there are data that the chemical weapons have been used, and used specifically by the regular army, this evidence should be submitted to the U.N. Security Council," added Putin, a former officer in the Soviet KGB. "And it ought to be convincing. It shouldn't be based on some rumors and information obtained by special services through some kind of eavesdropping, some conversations and things like that..."

Asked what kind of evidence on chemical weapons use would convince Russia, Putin said it "should be a deep and specific probe containing evidence that would be obvious and prove beyond doubt who did it and what means were used..."

http://www.cbsnews.com/8301-202_162-57601235/putin-russia-might-let-u.n-ok-strike-against-syria/

While the interview did not endorse action, he left room with sufficient scientific evidence. The USA and Russia have worked hard since 1992 as signatories to the CWC on the reduction of their own stockpiles of WMD. Not only chemical, but biological and nuclear.

Russia recieved American help and money to help destroy its stockpile and is 90% down. The USA has eliminated 57% and has more work from by the stockpiles by GWB which must be destroyed. Syria and North Korea did not sign onto the CWC but 189 nations have.

Iraq was producing them before the first Gulf War and still had some in 2009 but they are heavily damaged. It has always been said that CW are the poor man's nuclear bomb and that's why it's been hard to get those who have them to give them up, it's their ultimate tool.

http://en.wikipedia.org/wiki/Chemical_Weapons_Convention

The Arab League, that Kerry mentioned as being willing to pay for action in Syria, has not agreed with its members who reacted harshly to the Arab Spring. Libya was suspended because of its actions toward protestors and that is why there was no hue and outcry over the toppling of Quaddafi. The interim government has been given his seat.

Assad's regime in Syria is also suspended, because of his violence against his opponents. The Arab League picked a rebel force, the Syrian National Coalition, to take Assad's seat in the League in 2013:

A wave of criticism rose as the Arab League sent in December 2011 a commission "monitoring" violence on people protesting against the regime. The commission was headed by Mohammad Ahmed Mustafa al-Dabi, who served as head of Omar al-Bashir's military intelligence, while war crimes including genocide were allegedly committed on his watch.[15][16][17]

On 6 March 2013, the Arab League granted the Syrian National Coalition Syria's seat in the Arab League.

http://en.wikipedia.org/wiki/Arab_league

A read of the Wikipedia page there shows that the Arab League, composed of 22 nations, which has regulated trade and other things in the countries connected by language and tradition, is not a fly-by-night or a USA creation. They have their own interests and have acted upon them, and worked with the USA and Britain as that shows.

I'd love to see a joint task force of Russians and the USA and all other nations who are willing go to Syria and take out these weapons and tell Assad to know it off. Then go home again.

If Assad wants to 'give a peace a chance,' he can let them in to inspect and clear this up and maybe even help him meet the needs of his people and not kill them. If he's determined to keep warning war on his own people with CW and using them on his neighbors as he's said that he would out of revenge, there will be a problem either way.