"It's not correct to put me in any one philosophical or economic camp, because I've learned from many. But one is American libertarianism, market libertarianism. So as far as markets are concerned I'm a libertarian, but I have enough expertise in politics and history to understand that a free market ends up as monopoly unless you force them to be free.
WikiLeaks is designed to make capitalism more free and ethical."
So, core principles: open information, ethical capitalism.
His influences and associations with people like Noam Chomsky (ethical political economy), Gavin MacFayden (open information) and others, seem to reinforce this.
I'm not sure that Russian oligarchy, and restrictions on press freedoms/speech etc. would really jive with Julian's worldview. He does seem to have a particular bone to pick with US imperialism, so I wouldn't rule out accepting help from the enemy of his enemy.