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Kaliningrad, city, seaport, and administrative centre of Kaliningrad oblast (region), Russia. Detached from the rest of the country, the city is an exclave of the Russian Federation. Kaliningrad lies on the Pregolya River just upstream from Frisches Lagoon. Formerly capital of the dukes of Prussia & later capital of East Prussia, city was ceded to the Soviet Union in 1945 under the Potsdam agreement.

Encyclopedia Britannica

Kaliningrad: City, Kaliningrad oblast, Russia. Also known as: Königsberg, Królewiec

News • Russia closes Polish consulate in Kaliningrad in tit-for-tat diplomatic row • July 11, 2025, (ABC News (U.S.))

Kaliningrad, city, seaport &  admin centre of Kaliningrad oblast (region), Russia. Detached from rest of the country, city is an exclave of Russian Federation. 

Kaliningrad lies on the Pregolya River just upstream from Frisches Lagoon. Formerly capital of the dukes of Prussia & later capital of East Prussia, the city was ceded to Soviet Union in 1945 under the Potsdam agreement.

Kaliningrad, Russia:
The old town of Königsberg (“King’s Mountain”) grew up around fortress built in 1255 by Teutonic Knights on advice of Přemysl Otakar II, king of Bohemia, after whom place was named. Its first site was near fishing town of Steindamm, after its destruction by Prussians in 1263, it was rebuilt near where city now stands. Königsberg received civic privileges in 1286 and entered the Hanseatic League in 1340. From 1457 it was the residence of the grand master of the Teutonic Knights, and from 1525 until 1618 the residence of the dukes of Prussia. The trade of Königsberg was much hindered by constant shifting & silting up of the channels leading to its harbour, the First Northern War (1655–60) did immense damage the city, but be4 end of 17th century it had almost recovered. In 1701, in the chapel of the castle, Elector Frederick III of Brandenburg crowned himself the first king of Prussia—as Frederick I. In 1724 Frederick William I of Prussia united nearby Löbenicht and Kneiphof with Königsberg to form a single city. Again...

Königsberg suffered severely during the Napoleonic Wars was the scene of the deliberations led to successful uprising of Prussia against Napoleon again. During the 19th century opening of a railway system in East Prussia & Russia gave a new impetus to city’s commerce, making it principal outlet for Russian staples as grain, seeds, flax, and hemp. Under Prussia & then Germany the town was, after Kiel, main naval base on the Baltic Sea & a key to defense of eastern frontier. Its modern fortifications begun in 1843 & completed in 1905...

...Warning to Kremlin that NATO forces could take control of it "in a timeframe that is unheard of." The remarks from U.S. Army Europe & Africa commander General Chris Donahue are some of the strongest yet from a Western military official...

This small Kaliningrad, Russia: in under Moscow control, and if there is a real war. This will be what U.S.A. maybe interested...  see map ✓closer next to Poland below...