Drawn to the shape in the resolution (height 2 : length 3, two equal stripes). The law does not give color codes, so we chose the colors in the drawing.
Ranks are among the 193 UN member states, from most people and from largest area.
The flag of Ukraine is set by a 1992 resolution of the Verkhovna Rada, the parliament: two horizontal stripes of equal width, blue at the top and yellow at the bottom, with a height-to-length ratio of 2 to 3.
In 2025 the population is about 39.0 million, the 40th most people of the 193 UN member states. That is about 1/3 of Japan’s (about 123 million).
The area is 603,500 km², the 43rd largest of the 193. That is about 1.6 times Japan’s area.
If we work out the number of people per square kilometer (population density), it is about 65.
Ukraine joined the United Nations on October 24, 1945.
It was a member before Japan joined in 1956.
26 other countries joined on the same day.
There is no single right answer. Talking it over with someone at home is a good way to learn.