“We are protecting international law, not Syria” - Putin
Putin says recent events have prompted him to speak directly to the American people and their political leaders through a newspaper article.
Russian President Vladimir Putin has made a direct personal appeal to the American people over the Syrian crisis.
In an opinion article in the New York Times, he warns that a US military strike against Syria could unleash a new wave of terrorism.
He says millions of people see the US not as a model of democracy but as relying on brute force.
The US and Russia are due to hold talks in Geneva later over Syria's chemical weapons arsenal.
In the New York Times article, Mr Putin says recent events have prompted him to speak directly to the American people and their political leaders.
He warned that the UN could suffer the same fate as its precursor, the League of Nations, if "influential countries bypass the United Nations and take military action without Security Council authorisation".
"The potential strike by the United States against Syria, despite strong opposition from many countries and major political and religious leaders, including the Pope, will result in more innocent victims and escalation, potentially spreading the conflict far beyond Syria's borders," he says.
"A strike would increase violence and unleash a new wave of terrorism. It could undermine multilateral efforts to resolve the Iranian nuclear problem and the Israeli-Palestinian conflict and further destabilise the Middle East and North Africa. It could throw the entire system of international law and order out of balance."
Mr Putin said Russia was not protecting the Syrian government "but international law".
Moscow, an ally of Syrian President Bashar al-Assad, has proposed putting the weapons under international control before destroying them.
Damascus has agreed, at least partially, to the proposal, and US President Barack Obama to put military action against Syria on hold.
The US blames the Syrian government for a chemical weapons attack near Damascus last month that killed hundreds. Syria blames the attack on rebels.
As the diplomatic efforts continue, the Syrian army has been trying to retake the Christian town of Maaloula which was overrun by rebel forces - including members of the al-Qaeda-linked al-Nusra Front - at the weekend.