Kuril Islands dispute in the context of "Sea of Okhotsk"

Hokkaido (Japanese: 北海道, Hepburn: Hokkaidō; pronounced [hok.kaꜜi.doː] , lit. 'Northern Sea Circuit'; Ainu: Aynu Mosir, lit. 'Land of the Ainu') is the second-largest and northernmost of Japan's four main islands. Together with its surrounding islands, it comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu. The two islands are connected by railway via the Seikan Tunnel.

The largest city on Hokkaido is its capital, Sapporo, which is also its only ordinance-designated city. Sakhalin lies about 43 kilometres (27 mi) to the north of Hokkaidō. To the east and northeast are the Kuril Islands, which are administered by Russia. The four most southerly are claimed by Japan. Hokkaido's position on the northern end of the Japanese archipelago results in a colder climate, with the island seeing significant snowfall each winter. Despite the harsher climate, it serves as an agricultural breadbasket for many crops.

The Kuril Islands or Kurile Islands are a volcanic archipelago administered as part of Sakhalin Oblast in the Russian Far East. The islands stretch approximately 1,300 km (810 mi) northeast from Hokkaido in Japan to Kamchatka Peninsula in Russia, separating the Sea of Okhotsk from the north Pacific Ocean. There are 56 islands and many minor islets. The Kuril Islands consist of the Greater Kuril Chain and, at the southwest end, the parallel Lesser Kuril Chain. The group termed the 'South Kurils' consists of those of the Lesser Kuril Chain together with Kunashir and Iturup in the Greater Kuril Chain. The Vries Strait between Iturup and Urup forms the Miyabe Line dividing the North and South Kurils. The Kuril Islands cover an area of around 10,503.2 square kilometres (4,055.3 sq mi), with a population of roughly 20,000.

The islands have been under Russian administration since their 1945 invasion by the Soviet Union near the end of World War II. Japan claims the four southernmost islands, including two of the three largest (Iturup and Kunashir), as part of its territory, as well as Shikotan and the unpopulated Habomai islets, which has led to the ongoing Kuril Islands dispute. The disputed islands are known in Japan as the country's "Northern Territories".

Hokkaido (Japanese: 北海道, Hepburn: Hokkaidō; pronounced [hok.kaꜜi.doː] , lit. 'Northern Sea Circuit'; Ainu: Aynu Mosir, lit. 'Land of the Ainu') is the second-largest and northernmost of Japan's four main islands. Together with its surrounding islands, it comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaido from Honshu. The two islands are connected by railway via the Seikan Tunnel.

The largest city on Hokkaido is its capital, Sapporo, which is also its only ordinance-designated city. Sakhalin lies about 43 kilometres (27 mi) to the north of Hokkaido. To the east and northeast are the Kuril Islands, which are administered by Russia. The four most southerly are claimed by Japan. Hokkaido's position on the northern end of the Japanese archipelago results in a colder climate, with the island seeing significant snowfall each winter. Despite the harsher climate, it serves as an agricultural breadbasket for many crops.

The Lesser Kuril Chain (Russian: Малая Курильская гряда, Japanese: 小しょう千島ちしま列島れっとう, Shō Chishima Rettō; Japanese pronunciation: [ɕo̞ː t͡ɕiɕima̠ ɾe̞t̚to̞ː]), is an island chain in the northwestern Pacific Ocean. The islands are administered as part of Yuzhno-Kurilsky District of Sakhalin Oblast, Russia, and many sources consider the chain to be geographically part of the Kuril Islands. However, the Japanese government claims that these islands are not part of the Kuril Islands and are instead minor islands of Hokkaido.

The Lesser Kuril Chain lies northeast of the Nemuro Peninsula in Hokkaido, near the southwestern end of the Greater Kuril Chain, from which it is separated by the South Kuril Strait. It consists of Shikotan, the Habomai Islands and several small islands lying close to the Shikotan. The chain parallels, but is much shorter than, the Greater Kuril Chain, from which the Lesser Kurils lie to the south-east.

Kunashir Island (Russian: Кунаши́р, romanized: Kunashír; Japanese: 国後島, romanized: Kunashiri-tō; Ainu: クナシㇼ, romanized: Kunasir), possibly meaning Black Island or Grass Island in Ainu, is the southernmost island of the Kuril Islands. The island has been under Russian administration since the end of World War II, when Soviet forces took possession of the Kurils. It is claimed by Japan (see Kuril Islands dispute).

Iturup (Russian: Итуру́п, romanized: iturúp; Japanese: 択捉島, romanized: etorofu-tō), also historically known by other names, is an island in the Kuril Archipelago separating the Sea of Okhotsk from the North Pacific Ocean. The town of Kurilsk, administrative center of Kurilsky District, is located roughly midway along its western shore. Iturup is the largest and northernmost of the southern Kurils, ownership of which is disputed between Japan and Russia. It is located between Kunashiri 19 km (12 mi) to its southwest and Urup 37 km (23 mi) to its northeast. The Vries Strait between Iturup and Urup forms the Miyabe Line dividing the predominant plants of the Kurils.

The native inhabitants of the islands since at least the 14th century were the Ainu. Various European explorers passed the area over the years but settlement varied between Russian and Japanese. The island was formally claimed as Japanese territory in 1855. Near the end of the Second World War in 1945, the Soviet Union occupied the southern Kurils and forcibly removed its Japanese residents. Japan continues to claim the islands and considers the northern edge of the island to be its own northernmost point.

Shikotan, also known as Shpanberg or Spanberg, is an island in the Kurils administered by the Russian Federation as part of Yuzhno-Kurilsky District of Sakhalin Oblast. It is claimed by Japan as the titular Shikotan District (色丹郡, Shikotan-gun), organized as part of Nemuro Subprefecture of Hokkaido Prefecture. The island's primary economic activities are fisheries and fishing, with the principal marine products being cod, crab, and kelp.

The Habomai Islands (Japanese: 歯舞群島, romanized: Habomai guntō; Russian: Хабомаи, romanized: Khabomai) are a group of uninhabited islets (but for the Russian guards stationed there) in the southernmost Kuril Islands.

The islands have been under Soviet/Russian administration since the 1945 invasion by the Soviet Union near the end of World War II. But together with Iturup (Etorofu), Kunashir (Kunashiri), and Shikotan, the islands are claimed by Japan.

Russian irredentism (Russian: русский ирредентизм) refers to territorial claims made by the Russian Federation to regions that were historically part of the Russian Empire and the Soviet Union, which Russian nationalists regard as part of the "Russian world". It seeks to create a Greater Russia by politically incorporating ethnic Russians and Russian speakers living in territories bordering Russia. This ideology has been significantly defined by the regime of Vladimir Putin, who has governed the country since 1999. It is linked to Russian neo-imperialism.

Russian troops currently occupy parts of three neighbouring countries: southern and eastern Ukraine, Abkhazia and South Ossetia in Georgia, and the Transnistria region of Moldova. Since it began in 2014, the Russo-Ukrainian War has been described by much of the international community as being a culmination of Russia's irredentist policies towards Ukraine. Examples of these irredentist policies being implemented in this conflict include the Russian annexation of Crimea in 2014 and the ongoing Russian invasion of Ukraine, which saw the Russian annexation of southeastern Ukraine in 2022.