Which country's flag is this?

The national flag of Romania is a tricolor with vertical stripes, beginning from the flagpole: blue, yellow and red. It has a width-length ratio of 2:3.

The Constitution of Romania provides that "The flag of Romania is tricolor; the colors are arranged vertically in the following order from the flagpole: blue, yellow, red". The proportions, shades of color as well as the flag protocol were established by law in 1994 and extended in 2001.

The flag is coincidentally very similar to the civil flag of Andorra and the state flag of Chad. The similarity with Chad's flag, which is identical apart from allowing a broader range of shades of blue, yellow and red, has caused international discussion. In 2004, Chad asked the United Nations to examine the issue, but then-president of Romania Ion Iliescu announced no change would occur to the flag. The flag of Moldova is related to the Romanian tricolor, except it has a 1:2 ratio, a lighter shade of blue, a slightly different tint of yellow, and the Moldovan coat of arms in the middle. The civil ensign of Belgium uses black rather than blue.