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Union State
The Union State is a supranational entity established by a 1999 treaty between Russia and Belarus that includes collective-security provisions; invoking it could require Belarus to join Russia in treating a Ukrainian strike on Belarusian territory as an attack on both states.
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#26 2 Aug
Mentioned in: Belarus forms brigade 40km from Ukraine
Russia-Ukraine War 2026#22 26 Jun
Provided the legal basis for Moscow's leverage over Belarus
Russia-Ukraine War 2026: Moscow pulls Lukashenko the other way#22 22 Jun
Mentioned in: Belarus relays go dark, no shot fired
Russia-Ukraine War 2026#21 20 Jun