"I discussed our assessment and (Swedish Prime Minister Fredrik Reinfeldt) and I are in an agreement that in the face of such barbarism the international community cannot be silent," Obama said at a joint news conference in Stockholm along with Reinfeldt.
"Failing to respond to this attack would only increase the risk of more attacks and that possibility that other countries would use these weapons, as well," he said.
"My credibility is not on the line. The international community's credibility is on the line, and America and Congress' credibility is on the line because we give lip service to the notion that these international norms are important," Obama said.
Responding to a question, he said the red line against the use of chemical weapons was not set by him.
"I didn't set a red line. The world set a red line. The world set a red line when governments representing 98 per cent of the world's population said the use of chemical weapons are abhorrent and passed a treaty forbidding their use even when countries are engaged in war," he said.
The US has alleged that the nerve agent sarin was used by the Bashar al-Assad regime on August 21 and that at least 1,429 people were killed, including over 400 children, a charge denied by the Syrian government.
Meanwhile, Putin in an interview with Russia's state Channel 1 television said any military strikes without UN approval would be "an aggression", as he called for evidence on chemical weapons attack to be presented to the Security Council.
He, however, softened his tone ahead of the G20 summit in Russia, saying he has not ruled out supporting a UN Security Council resolution authorising force, if it was proved "beyond doubt" that the Syrian government used chemical weapons.
Putin said it was "ludicrous" that the Assad regime, an ally of Russia, would use chemical weapons at a time when it was gaining ground against the rebels.
"If there is evidence that chemical weapons were used, and by the regular army... Then this evidence must be presented to the UN Security Council. And it must be convincing," Putin said.
But he added that Russia would "be ready to act in the most decisive and serious way" if there was clear proof of what weapons were used and who used them.
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