S7, a Russian airline, put out this ad to show the massive billboards it has hung around Moscow and Kiev, linking the two cities together with a peace sign.

The company knows its audience — many of the thousands of people who attended an anti-war rally in Moscow this month came from the urban middle class, who tend to be the country's frequent fliers. A 2012 poll found that fewer than 7 percent of Russians traveled abroad at least once a year.

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