The Reform UK leader told the BBC that "of course" the war was President Vladimir Putin's fault.
But he added that the expansion of the EU and Nato gave him a "reason" to tell the Russian people "they're coming for us again".
In an interview with the BBC's Nick Robinson, Mr Farage was challenged over his judgement and past statements, including when he named Russian President Vladimir Putin as the world leader he most admired in 2014.
"I said I disliked him as a person, but admired him as a political operator because he's managed to take control of running Russia," Mr Farage said.
He was then pressed over
a social media post in February 2022, external, when he claimed the Russian invasion of Ukraine was "a consequence of EU and Nato expansion".
Mr Farage said he had been arguing since the 1990s that "the ever eastward expansion" of the Nato military alliance and the EU was giving President Putin "a reason to [give to] his Russian people to say they're coming for us again and to go to war".
He added: "We provoked this war. Of course, it's [President Putin's] fault."