Speaking after he met British Prime Minister David Cameron in London, Rasmussen welcomed the recent US-Russian agreement under which the Assad regime says it will give up its poison gas stocks.
Damascus said earlier it was confident the UN Security Council will not adopt a resolution on its chemical weapons under Chapter VII, which could allow the use of force.
Also Read
"I do believe that the credible threat of military action was the reason why diplomacy got a chance and I think in order to keep momentum in the diplomatic and political process the military option should still be on the table," he told reporters in Downing Street.
The alliance chief said it was "crucial that the UN Security Council expeditiously adopts a firm resolution that can constitute the framework for a swift, secure and verifiable elimination of all chemical weapons in Syria".
Rasmussen said the use of chemical weapons "is a crime, is a violation of international law and those responsible must be held accountable".
US President Barack Obama threatened military action against Syria following an August 21 chemical weapons attack on a Damascus suburb that allegedly killed hundreds of people, but held off after the US-Russian deal.
The United States, France and Britain want compulsory measures under Chapter VII of the UN Charter if Syria does not uphold the disarmament plan.
But Russia, a key ally of Syrian President Bashar al-Assad, is firmly opposed to anything that could pave the way for the use of force.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)