Scavenging from a Sucha Fail post. Is Russia still at war with Japan?
[link to avalon.law.yale.edu (secure)]
Apparently, this war has never been declared over.

[link to www.japantimes.co.jp (secure)]

QUOTE
Prime Minister Fumio Kishida said he told Ukrainian President Volodymyr Zelenskyy on Friday that Japan considers Russia’s annexation of parts of southern and eastern Ukraine a violation of international law.
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Japanese Prime Minister announces intention to conclude peace treaty with Russia
Prime Minister Kishida said that Japan remains committed to signing a peace treaty with Russia.
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[link to ria.ru (secure)]

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Negotiations with Japan on the conclusion of peace are now impossible, Peskov said.
Peskov called negotiations on a peace treaty with Japan impossible in the current conditions
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[link to ria.ru (secure)]