The delegation, which reportedly included WikiLeaks founder Julian Assange's father John Shipton, met Assad on December 23, according to a post on the Syrian president's Twitter feed.

The WikiLeaks Party, founded as part of Assange's failed campaign for election to Australia's parliament in September, is distinct from the whistleblowing group which has said it neither knew about the meeting nor approved it.

Bishop said the delegation's actions risked involving Australia in the Syrian conflict which has killed more than 1,30,000 people since it began in March 2011, according to the Syrian Observatory for Human Rights.

"It's an extraordinarily reckless thing for an organization registered as a political party in Australia to try and insert itself in the appalling conflict in Syria for their own political ends," Bishop said.

"It's certainly counter-productive. It is not in support of the sanctions regime that Australia has in place, in fact it risks undermining the sanctions regime we have in place, and it risks aligning Australia with one side of the conflict in Syria, which is something we would not do," he added.

The WikiLeaks Party website said the meeting was aimed at showing solidarity with the Syrian people and voicing opposition to western military intervention.

"The WikiLeaks Party was the first party in Australia to warn of the deadly consequences of any Western military intervention in Syria," it said in a December 22 post on its website.

It went further by questioning the credibility of the excuses of such intervention based on unsubstantiated reports of the Syrian Army's use of chemical weapons against Syrian civilians.

"The same excuses", which turned out to be "no more than fabrications and lies" had been used to justify the US-led war in Iraq, the party said.

Australia's opposition Labour Party had on Tuesday described the meeting as irresponsible.

"The Assad regime has been widely criticized and correctly criticized around the world," Labour lawmaker Chris Bowen said.

"For an Australian political party to think it's sensible to go and have discussions and try and provide some legitimacy, is something I think which they have to explain," he added.


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