'The three leaders agreed that the military strikes taken against the Syrian Regime's chemical weapons sites had been a success, ' a No 10 spokesman said.
NATO Secretary General Jens Stoltenberg on Saturday backed the joint airstrikes carried out by the USA, United Kingdom and France in Syria.
Russian efforts to veto United Nations action against Syria left US, British and French allies no option but to launch airstrikes against key installations, North Atlantic Treaty Organisation chief Jens Stoltenberg said.
At the same time, Stoltenberg expressed his conviction that those responsible for chemical attacks must be held to account.
"NATO considers the use of chemical weapons as a threat to worldwide peace and security, and believes that it is essential to protect the Chemical Weapons Convention".
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"I urge all member states to act responsibly in these risky circumstances", Guterres said.
US President Donald Trump Friday announced a joint US-British-French operation against Syria, targeting the Assad regime for a chemical attack last week which had left several dead. Secretary General Jens Stoltenberg said the strikes were about making sure chemical weapons can not be used with impunity.
"The EU will stand with our allies on the side of justice", he added.
Saudi Arabia on April 14 expressed its full support for US -led strikes on Syrian government military installations, saying they were a response to "regime crimes" against civilians.