The Russian Foreign Ministry on Tuesday summoned the German ambassador over a new Baltic navy port. Moscow threatened “a corresponding response” and “extremely negative consequences.”

German Ambassador to Russia Alexander Graf Lambsdorff on Tuesday confirmed that he had been summoned by the Russian Foreign Ministry over the opening of a new Baltic Sea naval headquarters in the German port city of Rostock.

Moscow claims that the establishment of the site, which will also host NATO allies, is a “blatant breach” of the terms of the Two-Plus-Four Agreement — signed around the time of German reunification in 1990 — prohibiting the stationing of NATO troops on former East German territory.

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The Rostock headquarters, inaugurated by German Defense Minister Boris Pistorius on Monday, is designed to beef up NATO defenses on the Baltic in the face of Russian aggression.