Moscow: Russia on Monday condemned as hysterical the angry Western reaction to its veto of a UN resolution condemning Syria's crackdown on protesters, as its top diplomat prepared for a mission to Damascus.

Foreign Minister Sergei Lavrov expressed frustration that Western states did not postpone Saturday's UN Security Council vote until after his visit Tuesday to Damascus, where he will deliver a message to President Bashar al-Assad.

"Some comments from the West on the UN Security Council vote, I would say, are indecent and bordering on hysteria," Lavrov said.

"Such hysterical comments are aimed at suppressing what is actually happening and what has happened," said Lavrov.

"It reminds me of the proverb: 'he who gets angry is rarely right'," he added.

Lavrov reaffirmed Russia's position that the resolution was wrong to blame Assad's regime for the violence and should have also taken aim at the opposition.

"In Syria there is more than one source of violence. There are several there," he said.

Russian news agency ITAR-TASS said that alongside the head of the Russian Foreign Intelligence Agency (SVR) Mikhail Fradkov, Lavrov would deliver a message from President Dmitry Medvedev to Assad.

But Lavrov would not divulge the purpose of the mission.

"When you go on a mission on the order of the head of state then the purpose of the mission is usually only revealed to the person it is addressed to. If I tell you everything now then what is the point?"

"You can talk to people just through the media. And some countries prefer to do things this way. But foreign policy demands a more classical approach."

Lavrov regretted that Western powers had not postponed the vote, saying that Moscow had asked for a delay of a few days so that the outcome of his visit to Syria could be discussed.

"The co-authors of the resolution over-hastily decided to put it to a vote," he said.