Another pointed out that his mother, Princess Diana, visited war-torn Bosnia after conflict waged between the joint force of Bosnia and Herzegovina, a former republic of Yugoslavia, and Croatia and Serbia, from 1992 to 1995.
His comment comes after US CBS News correspondent Charlie D'Agata was similarly skewered for making the same comparison, calling Ukraine "relatively civilised" and unlike countries in the Middle East.
"This isn't a place, with all due respect, like Iraq or Afghanistan, that has seen conflict raging for decades," D'Agata said on air.
"This is a relatively civilised, relatively European — I have to choose those words carefully too — city, one where you wouldn't expect that or hope that it's going to happen."
D'Agata later apologised, saying, "I spoke in a way I regret, and for that I'm sorry."
William and Kate expressed their "solidarity" with the people of Ukraine soon after Vladimir Putin launched his attack, saying in a tweet "we stand with the President and all of Ukraine's people as they bravely fight for that future".
President Zelenskyy responded thanking them for their support.
"Olena and I are grateful to the Duke and Duchess of Cambridge that at this crucial time, when Ukraine is courageously opposing Russia's invasion, they stand by our country and support our brave citizens," he said.
"Good will triumph."
Tanks first rolled over Ukraine's borders on February 24 after Putin ordered his long-feared invasion.
He declared that the neighbouring nation "belongs to Russia" as he followed through on promises to seize territory given up by the country in the fall of the Soviet Union.
Ukraine has been in resistance ever since, with thousands of petrified families making desperate dashes to the Polish border, many terrified they will never see their relatives again.
At least two million people have already fled their homes to escape the conflict, with four million expected to be displaced as the Russian invasion continues.
