LONDON — George Clooney has delivered a message of support to the pro-Western demonstrators in Ukraine in a video message sent to heavyweight boxing champion Vitali Klitschko, who has become one of the leaders of the opposition movement in Ukraine.

In the video, posted on YouTube, Clooney said: “I wanted to send a message to all you brave citizens of Ukraine who are struggling to look forward and not back.

“We here in the United States have great affinity for those seeking democracy. We have learned through trial and error that true democracy cannot exist without a free and fair and honest election.

“You cannot have a democracy when you arrest and harm its peaceful protesters. You certainly cannot have a true democracy if you take political prisoners like (former Prime Minister Yulia) Tymoshenko, simply because you disagree with the way they want to govern.

“So let me just say this to all of you in the square in Kiev, all around Ukraine, when you look to the West, know that we are looking back at you with great admiration.

“We wish you a peaceful and safe mission. We wish you the government that you want, and wish you the strength to carry on.

“Good luck.”