Polish Foreign Minister Radek Sikorski says is ordering the closure of Russia’s consulate in the southern city of Krakow after Polish authorities said Russia was responsible for a fire that destroyed a shopping center in Warsaw last year
Archived version: https://archive.is/newest/https://www.independent.co.uk/news/poland-krakow-warsaw-donald-tusk-vietnamese-b2749088.html
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Sounds like an armed attack on a NATO member.