The Pan-Slavic colors reference article from the English Wikipedia on 24-Jul-2004
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Pan-Slavic colors

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The Pan-Slavic colors, red, blue and white, are colors used on the flags of most Slavic states and peoples. Their use symbolizes the common origin of the Slavic peoples. They were first used on and originate from the Flag of Russia.
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Flag of Croatia
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Flag of Czech Republic
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Flag of Russia
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Flag of Serbia
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Flag of Serbia and Montenegro
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Flag of Slovakia
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Flag of Slovenia
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Flag of Sorbs

The flag of Bulgaria also originated from the same Pan-Slavic colors, but the blue was replaced with green, because Bulgaria was developed as agricultural country after its independence in 1878. The flag of Montenegro also consist of the same colors, in order as the flag of Serbia, but its blue color is brighter. The flag of Eastern Rumelia, a former Turkish province now part of Bulgaria, also consisted of the same colors.

These three colors are, without the same symbolism, also used on the flags of many non-Slavic nations, including the United States, the United Kingdom, and France.

See also: Pan-Slavism, Pan-African colors, Pan-American colors