Japan disputes Russian sovereignty over the Kuril Islands but has been endlessly delaying this issue for a century or so. Ukraine cannot follow Japan’s strategy. It will just not survive this long, especially in the current state of civil war which it does not want to put an end to.
Recurring pro-Kremlin disinformation narrative about failing Ukraine and the war in Ukraine. It disregards the extensive factual evidence confirming ongoing Russian military presence in Donbas. Prior debunks of this narrative can be found here and here.
The war in Ukraine was supported by Russian Federation armed forces, it is not a civil war as some want to portray it. The European Union stated in July 2014 that "arms and fighters continue flowing into Ukraine from the Russian Federation". At the NATO Summit in Wales in September 2014, NATO leaders condemned in the strongest terms Russia’s military intervention in Ukraine and demanded Russia to stop and withdraw its forces from Ukraine and from the country’s border. NATO leaders also demanded Russia to comply with international law and its international obligations and responsibilities; refrain from aggressive actions against Ukraine; halt the flow of weapons, equipment, people and money across the border to the separatists; and stop fomenting tension along and across the Ukrainian border.
The Office of the Prosecutor of the International Criminal Court has stated that “[t]he information available suggests that the situation within the territory of Crimea and Sevastopol amounts to an international armed conflict between Ukraine and the Russian Federation. This international armed conflict began at the latest on 26 February when the Russian Federation deployed members of its armed forces to gain control over parts of the Ukrainian territory without the consent of the Ukrainian Government.”