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 of convenience enforcement by countries when they visit ports in those countries, called port state control. International law requires that every merchant ship be registered in a country. The country in which a ship is registered is its flag state, and the flag state gives the ship the right to fly its civil ensign. A ship operates under the laws of its flag state, and these laws are used if the ship is involved in an admiralty case. A ship's flag state exercises regulatory control over the vessel and is required to inspect it regularly, certify the ship's equipment and crew, and