List of territorial disputes
Territory Claimants Notes
Russia-Ukraine border Russia Ukraine Since 2001 Russia delays an establishment of the border with Ukraine
Tuzla Island and Strait of Kerch ; Sarych Russia Ukraine The conflict arose in 2003 when the Russian authorities started to build a dam towards the island . Ukraine then established a border garrison on the island for a closer surveillance . The reason for the conflict was the fact that Tuzla island 's strategic location gave Ukraine full rights over the main channel in the Strait of Kerch and , thus , the access to the Sea of Azov . The conflict was based on the division of the Black Sea Fleet and a lease agreement of the Sevastopol Naval facilities
Sea of Azov Russia Ukraine ( Mutual jurisdiction ) On 25 November 2018 Russia blocked three Ukrainian Navy vessels from entering Sea of Azov
Crimea Russia Ukraine In 2014 , Russian forces occupied and annexed the Crimean peninsula , seizing it from Ukrainian territories . Russian claims to Crimea are not internationally recognized . The United Nations , through General Assembly Resolution 68/262 , affirmed that Crimea was part of Ukraine and that Russia 's annexation is invalid . Several nations imposed international sanctions on Russia in reaction to its action
Aegean dispute , Imia/Kardak Greece Turkey Broad number of delimitation disputes about a.o . national airspace , territorial waters and exclusive economic zones . Includes Imia/Kardak dispute
Mont Blanc summit dispute France Italy France asserts that the principal peaks on the Mont Blanc massif - Dôme du Goûter , Punta Helbronner , and Mont Blanc lie in French territory , while Italy asserts that the summits are shared
Carlingford Lough and Lough Foyle boundary dispute Ireland United Kingdom Lough Foyle divides County Donegal , Republic of Ireland , and County Londonderry , Northern Ireland . Carlingford Lough divides County Louth , Republic of Ireland , and County Down , Northern Ireland
Gibraltar United Kingdom Spain Dispute over the interpretation of the Treaty of Utrecht and the location of the border
Dollart bay boundary dispute Germany Netherlands The exact course of the border through this bay is disputed , yet the countries have agreed to disagree by signing a treaty in 1960
Olivenza and Vila Real ( including the municipality of Táliga ) Spain Portugal In 1801 , during the War of the Oranges , Spain , with French military support , occupied the territory of Olivenza ( in Portuguese Olivença ) . During the Treaty of Vienna ( 1815 ) , the signatory powers ( including Spain ) agreed with the Portuguese arguments concerning its claim on Olivença but Spain never fulfilled its duty of giving the city of Olivença and its territory back to Portugal
Croatia-Serbia border dispute Croatia Serbia Limited areas along the Danube Parts of Osijek-Baranja and Vukovar-Syrmia Counties and West and South Bačka Districts
Island of Šarengrad Croatia Serbia
Island of Vukovar Croatia Serbia
Croatia-Slovenia border disputes Slovenia Croatia
Gulf of Piran Slovenia Croatia An agreement was signed ( and ratified by Croatia 's parliament on 20 November 2009 ) to pursue binding arbitration to both the land and maritime portions of this continuing dispute . In 2015 collusion between the Slovenian judge on the arbitration panel and a representative from the Slovenian government was uncovered . The Croatian Sabor voted to withdraw from the arbitration , citing allegations of significant breaches of arbitration rules by Slovenia as the reason . Despite this the arbitration tribunal continued its work , issuing a ruling in 2017
Military complex near Sveta Gera Slovenia Croatia The complex is in the area of Žumberak/Gorjanci
Prevlaka Croatia Montenegro
Sastavci Serbia Bosnia and Herzegovina
Tip of the Klek peninsula , and islands Veliki Školj and Mali Školj ( near Neum ) Croatia Bosnia and Herzegovina
Ongoing disputes between UN member/observer states -- Europe
Territorial disputes have occurred throughout history, over lands around the world. Bold indicates one claimant's full control; italics indicates one or more claimants' partial control.