Mayor Hamish McDouall said he unreservedly supported the motion, especially as Ukrainian local government representatives had been targeted by Russian forces.
He said Kyiv mayor Vitali Klitschko had been repeatedly threatened and there had been reports that mayors of two other Ukrainian cities had been abducted.
"We are all part of a 2000-year-old system of local government and we can only imagine what it must be like for these decision-makers being targeted," he said.
Councillor Helen Craig said she initially thought the motion was not council business but after seeing reports from Ukraine she had changed her mind.
"It is everybody's job to denounce war," she said.
"My parents, who were teenagers at the time, had to leave Holland during WWII and we lost whānau to the war. We need to show our support for the people of Ukraine."
Rural Community Board chairman Peter Oskam said he supported the motion.
"I fully endorse it," he said. "It's the right thing to do."
Deputy mayor Jenny Duncan said she supported the motion as a condemnation of all wars.
All councillors present at the meeting voted in favour of the motion.