Flag of Ukraine bands of blue and yellow colour."" (). In addition to the normal horizontal format, many public buildings, such as Verkhovna rada in Ukraine use vertical flags. Most town halls fly their town flag together with the national flag in this way; some town flags in Ukraine exist only in vertical form. The proportions of these vertical flags are not specified. When hung like a banner or draped, the blue band should be on the left, as illustrated. When flown from a vertical flagpole, the blue band must face the mast. The flag did not appear on Ukrainian official postal stamp
Flag strictly enforced. A national flag flown at sea is known as an ensign. A courteous, peaceable merchant ship or yacht customarily flies its ensign (in the usual ensign position), together with the flag of whatever nation it is currently visiting at the mast (known as a courtesy flag). To fly one's ensign alone in foreign waters, a foreign port or in the face of a foreign warship traditionally indicates a willingness to fight, with cannon, for the right to do so. As of 2009, this custom is still taken seriously by many naval and port authorities and is readily enforced