Syrian state television said government forces had shot down more than a dozen missiles, and claimed only the research facility in Damascus had been damaged.
The United States allies in the attacks are France and Britain.
Syrian forces fired 40 surface-to-air missiles during the operation, mostly after the attack was over, he said.
He says there is "no doubt" that the Syrian government is responsible.
Western powers blamed President Bashar al-Assad, but Syria and its ally Russian Federation categorically denied the claims and accused the West of "fabricating" the incident to justify military action.
But after days of Trump's telegraphing the coming assault, the strikes appear to have taken aim at targets more limited than some within his administration had championed, and the extent to which they would knock out Syria's chemical weapons production capacity was unclear Saturday. He is not giving details about what equipment is involved in the operation or what sites it is targeting.
Last week, President Donald Trump promised to withdraw from Syria.
In a possible reference to North Korea, Abe said the threat of nuclear, biological and chemical weapons is also becoming more serious in East Asia, and Japan will work with the United States and the worldwide community to keep the region peaceful and stable. "We weren't trying to kill a lot of people", he said.
The U.S. led airstrikes in a coordinated attack with United Kingdom and French allies against the regime of Syrian dictator Bashar Assad, President Trump announced Friday night.
In a message Prime Minister May announced early on Saturday morning that she has authorised British armed forces to "conduct coordinated and targeted strikes to degrade the Syrian regime's chemical weapons capability and deter their use".
Britain and France joined the overnight strikes - one of them near the capital Damascus - which were intended as a "strong deterrent" against Syrian President Bashar al-Assad's use of chemical weapons against his own people, Trump said in a televised speech.
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"To Iran and to Russian Federation, I ask: what kind of a nation wants to be associated with the mass murder of innocent men, women and children?" "They are crimes of a monster instead".
She also criticised Russian leader Vladimir Putin's failure to ensure Syria did not continue to use chemical weapons, a promise made in 2013. He said the three nations have "marshaled their righteous power". There is tyranny." He called the Middle East a "troubled place.
Some who support the strikes say that even if they fail to prevent Assad from using chemical weapons in the future, they will send the message that the global community is watching and intends to enforce the ban on chemical weapons that countries instituted after World War I.
The U.S. has about 2,000 troops on the ground in Syria as advisers to a makeshift group of anti-Islamic State fighters known as the Syrian Democratic Forces.
Trump spoke from the White House Friday night.
Instead, they chose to wait for an entire week, including setting the stage with several diplomatic attempts to set up an independent investigation into the attack at the United Nations that were doomed to fail, while US President Donald Trump unleashed a series of tweets threatening military action while simultaneously reaching out to Russian Federation.
The strikes were a response to an alleged chemical weapons attack carried out by Syrian President Bashar Assad's regime on April 7.
Nikki Haley, U.S. ambassador to the United Nations, said "the time for talk ended last night" with the allied attack on Syrian chemical weapons sites.
That's according to a source familiar with the president's plans, who was not authorized to speak publicly. But Friday night, the White House released what it said was "a significant body of information" that pointed to the use of chlorine gas - and possibly also the deadly nerve agent sarin.
The message for Assad, Russia and Iran: Wait long enough and the Americans will go away and the regime can do what it wants in Syria.
Defense Secretary James Mattis, new national security adviser John Bolton, Vice President Mike Pence and US ambassador to the United Nations Nikki Haley were all involved in the talks.