Iran has also condemned the strike.
Russian President Vladimir Putin believes that US cruise missile strikes on a Syrian air base broke international law and have seriously hurt US-Russia relations, news agencies cited the Kremlin as saying on Friday.
Putin's spokesman Dmitry Peskov was cited as saying that the Russian leader, a staunch ally of Syrian President Bashar al-Assad, regarded the US action as "aggression against a sovereign nation" on a "made-up pretext" and as a cynical attempt to distract the world from civilian deaths in Iraq.
Peskov was quoted as saying that Russia did not believe that Syria possessed chemical weapons and that the US move would inevitably create a serious obstacle to creating an international coalition to fight terrorism, an idea that Putin has repeatedly pushed.
Iran also condemned a US strike on a Syrian airbase on Friday as Britain and Australia gave their support, with Australian Prime Minister Malcolm Turnbull describing it as a "proportionate and calibrated response" to the use of chemical weapons.
US President Donald Trump ordered missile strikes against a Syrian airfield from which a deadly chemical weapons attack was launched, declaring he acted in America's "vital national security interest".
In a sharp escalation of the US military role in Syria, two US warships fired dozens of cruise missiles from the eastern Mediterranean Sea at the airbase controlled by President Bashar al-Assad's forces in response to the poison gas attack in a rebel-held area on Tuesday, US officials said.
Iran denounced the strike, the Students News Agency ISNA quoted a Foreign Ministry spokesman as saying. "Iran strongly condemns any such unilateral strikes...Such measures will strengthen terrorists in Syria...and will complicate the situation in Syria and the region," ISNA quoted Bahram Qasemi as saying.
Britain gave its backing. "The UK government fully supports the US action which we believe was an appropriate response to the barbaric chemical weapons attack launched by the Syrian regime and is intended to deter further attacks," a government spokesman said.
Turnbull said the strikes sent "a vitally important message" that the world will not tolerate the use of chemical weapons. "The retribution has been proportionate and it has been swift," he told reporters in Sydney. "We support the United States in that swift action."
Turnbull said the military action was not designed to overthrow the Assad regime, though the reported use of chemical weapons did "raise questions as to whether there can be any role for Mr Assad in any solution or settlement". Turnbull called on Russia to do more to ensure peace in Syria.
Indonesia, home to the world's largest Muslim population, said it also strongly condemned the use of chemical weapons in Syria. "At the same time, Indonesia is concerned with unilateral actions by any parties, including the use of Tomahawk missiles, in responding to the chemical weapon attack tragedy in Syria," Foreign Ministry spokesman Armanatha Nasir said in a text message. "Military actions, undertaken without prior authorisation of the UN Security Council, are not in line with international legal principles in the peaceful settlement of disputes, as stipulated in the UN Charter."
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