France, Australia, Great Britain, the Czech Republic the Netherlands, Russia, Luxembourg, Unites States, Slovenia, Slovakia, Cuba, Chile, Panama, Thailand, Liberia, Laos amongst many many more!
Liechtenstein's flag is blue in the top half and red in the bottom half. There is also a yellow/gold crown in the blue part.
France, United States, Russia, Australia, Cuba, United Kingdom, Liberia, probably a lot more but those are off the top of my head.
America, UK, Australia all have red blue and white in their flag
United Kingdom (England, Scotland and Wales)...and france and america
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