18th July 1918
see also Western Ukraine
imperf, crosses and circles wmk, typographed, thin paper.
|Description||Scott#||SG# †||Mi#||Y&T# ‡|
|10 shahiv buf||1||1, 6||39|
|20sh brown||2||2, 7||40|
|30sh ultra||3||3, 8||41|
|30sh blue||3a||3a, 8a|
|40sh ghreen||4||4, 9||42|
|50sh red||5||5, 10||43|
† Gibbons  lists another issue of the first set on "thick carton paper" SG6-10. Scott  notes that these "designs were earlier (April, 1918) utilised for money tokens, printed on thin cardboard … bit were not used as postage stamps. Gibbons states these "were issued for paper money but were also occasionally used for postage."
‡ Scott and Gibbons both list overprints of Russian stamps used in regions of Ukraine, but Y&T list and number these before what the other catalogues regard as the first issue.
Wikipedia  describes Ukraine as, "a sovereign country in Eastern Europe, bordered by Russia to the east and northeast, Belarus to the northwest, Poland and Slovakia to the west, Hungary, Romania, and Moldova to the southwest, and the Black Sea and Sea of Azov to the south and southeast, respectively. Ukraine is currently in territorial dispute with Russia over the Crimean Peninsula which Russia annexed in 2014 but which Ukraine and most of the international community recognise as Ukrainian.
|1923 Sc-B1 SG12||1941 Sc-N29 SG1||1992 Sc100 SG20|
Changes of Administration
the Ukrainian Soviet Rupublic, "proclaimed in Kiev on 14th March 1919" followed by, "alliance with Soviet Russia on 28th December 1920". Ukraine issued a semi-postal set in June 1923, became a republic of the USSR on 5th July 1923 and therafter used Russian stamps.
Scott and Gibbons list the German Occupation issues under Russia.
Ukraine declared independence on 24th August 1991 and this was confirmed in a referendum on 1st December 1991. At the time of writing (April 2016) it remains to be seen how the Russian invasion of Crimea will be resolved.
Link: Breakup of the USSR