Greater Ukraine (Ukrainian: Велика Україна; Velika Ukraina) or United Ukraine (Ukrainian: Соборна Україна; Soborna Ukraina) refers to an irredentist concept of the territory claimed by some Ukrainian nationalist groups outside the Republic of Ukraine which are considered part of national homeland by Ukrainians, based on the present-day or historical presence of Ukrainian populations in those areas.
Rise of nationalism 
The 10 commandments of the Ukrainian People's Party (1902-1907) were developed by Ukrainian nationalist, the leader of UPP Mykola Mikhnovsky in 1904. These commandments were kind of honor code for the party. They called for a one, united, indivisible, from the Carpathians to the Caucasus, independent, free, democratic Ukraine - a republic of working people.
Claimed regions 
Since Mikhnovsky the idea of ‘Ukrainian Independent United State’ (Ukrainian: Українська Самостійна Соборна Держава Ukrainska Samosiyna Soborna Derzhava) has been a key nationalist slogan, but many would argue that the ‘unification’ (соборність sobornist’) of Ukrainian lands was partially completed in 1939-45.
- Starodub region north of Chenrihiv
- the south-eastern parts of Voronezh
- Kursk and Rostov oblasts
- Kuban region
In the west, some radical nationalists would also covert the following territories:
- left bank of river Dniester in Moldova ( Transnistria (de facto) / western Moldova (de jure))
- north-eastern Slovakia: Prešov region
- south-eastern Poland: Chełm and Przemyśl territories
- south-western Belarus: Brest region
- northern Romania: southern Bukovina and the area around Maramureș
The possibility of Ukraine making serious territorial pretensions against its neighbors can be discounted (the boot is more likely to be on the other foot). Nevertheless, more radical Ukrainian nationalists may well attempt to take advantage of Russian difficulties in troubled regions such as the north Caucasus, and perhaps even further afield, particularly if any serious conflict should develop between Russia and Ukraine.
Ukrainians first settled the Kuban in 1792 and until the mid-twentieth century the majority of the population there identified themselves as Little Russians or Ukrainians. Due to adverse Russian and Soviet national policies, including the Holodomor, most of the population adopted a Russian self-identification, and the percentage of those who identified themselves as Ukrainians dropped from an official 55% (1926) to 0.9% (2002).
- (Russian) Мирчук П. Возрождение национальной идеи. — Киев: Украинская издательская спилка, 1999
- Andrew Wilson, Ukrainian nationalism in the 1990s: a minority faith, Cambridge University Press, 1997, p. 183