During World War II, the Germans operated a Dulag Luft transit prisoner-of-war camp for Allied POWs in the town. A local branch of the Peasant Battalions was established by the Polish resistance, under the cryptonym "Wystruć", the historic Polish name of the town. Several French forced laborers cooperated with the Polish resistance. The town was heavily bombed by the BritishRoyal Air Force on July 27, 1944. The town was stormed by Red Army troops on January 21–22, 1945. As part of the northern part of East Prussia, Insterburg was transferred from Germany to the Soviet Union after the war as previously agreed between the victorious powers at the Potsdam Conference. On 7 April 1946, Insterburg was renamed as Chernyakhovsk in honor of the Soviet World War II Army General, Ivan Chernyakhovsky, who commanded the army that first entered East Prussia in 1944.
After 1989, a group of people introduced the Akhal-Teke horse breed to the area and opened an Akhal-Teke breeding stable.
In September 2019 the local court ruled that the coat of arms was illegal because it carries "elements of foreign culture." The local court alleged that Russian laws do not allow the use of foreign languages and symbols in Russian state symbols and ordered the town "to remove any violations of the law."
The town's coat of arms, adopted in 2002, was based on the historic coat of arms of the town that before 1946 was known under its original Prussian name – Insterburg.
The full version of coat of arms in question has a picture of a Prussian man with a horn and the Latin initials G.F. for the Regent of Prussia George Frederick, margrave of Brandenburg-Ansbach (1543–1603), who gave Insterburg the status of town and with it his family coat of arms.
The case brought before the court follows a trend among several towns in the region that have announced their intentions to change their coat of arms as tensions mount between Russia and the West following the annexation of Crimea by the Russian Federation in 2014 and its support for pro-Russian separatists in eastern Ukraine.
^ Słownik geograficzny Królestwa Polskiego i innych krajów słowiańskich, Tom XIV (in Polish). Warszawa. 1895. p. 143.{{cite book}}: CS1 maint: location missing publisher (link)
^Kasparek, Norbert (2014). "Żołnierze polscy w Prusach po upadku powstania listopadowego. Powroty do kraju i wyjazdy na emigrację". In Katafiasz, Tomasz (ed.). Na tułaczym szlaku... Powstańcy Listopadowi na Pomorzu (in Polish). Koszalin: Muzeum w Koszalinie, Archiwum Państwowe w Koszalinie. p. 177.
^ Brenda, Waldemar (2007). "Pogranicze Prus Wschodnich i Polski w działaniach polskiej konspiracji w latach II wojny światowej". Komunikaty Mazursko-Warmińskie (in Polish) (4): 515.
^A. E. Henning: Topographisch-historische Beschreibung der Stadt Insterburg. Königsberg 1794, p. 44.
Правительство Калининградской области. Постановление №640 от 30 августа 2011 г. «Об утверждении реестра объектов административно-территориального деления Калининградской области», в ред. Постановления №877 от 21 ноября 2011 г «О внесении изменения в Постановление Правительства Калининградской области от 30 августа 2011 г. №640». Вступил в силу со дня официального опубликования. Опубликован: "Калининградская правда" (вкладыш "Официально"), №170, 15 сентября 2011 г. (Government of Kaliningrad Oblast. Resolution #640 of August 30, 2011 On the Adoption of the Registry of the Objects of the Administrative-Territorial Divisions of Kaliningrad Oblast, as amended by the Resolution #877 of November 21, 2011 On Amending the Resolution of the Government of Kaliningrad Oblast #640 of August 30, 2011. Effective as of the day of the official publication.).
Калининградская областная Дума. Закон №262 от 30 июня 2008 г. «Об организации местного самоуправления на территории муниципального образования "Черняховский городской округ"», в ред. Закона №370 от 1 июля 2009 г «О составе территорий муниципальных образований Калининградской области». Вступил в силу со дня официального опубликования. Опубликован: "Калининградская правда", №124, 11 июля 2008 г. (Kaliningrad Oblast Duma. Law #262 of June 30, 2008 On the Organization of the Local Self-Government on the Territory of the Municipal Formation of "Chernyakhovsky Urban Okrug", as amended by the Law #370 of July 1, 2009 On the Composition of the Territories of the Municipal Formations of Kaliningrad Oblast. Effective as of the day of the official publication.).