Steve Warren
"Let's see here. The U.S. is 10 times more awesome than Russia, therefore only 10% of Russian airstrikes can be effective. Right?"
How a U.S. propaganda line dissolves into embarrassment.
Pentagon spokesman Col. Steve Warren said at a briefing on Wednesday that at most, only 10% of Russian strikes are hitting the terrorist group ISIS (also known as the Islamic State, ISIL, and Daesh) in Syria.
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In a report posted Thursday on its website, the [Russian Ministry of Defense] noted that its jets flew 510 combat sorties and hit 1,888 "terrorist objects" in Syria. The previous week's report claimed 464 sorties that hit a total of 1,354 "terrorist objects."

Daily reports from the U.S. military for the same period indicate a much lower level of activity: 16 targets struck in Syria.
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x * 16 = 1,888 * 0.1
x ~= 12