nordkoreanisch
North Korean
Relating to North Korea, its inhabitants, its culture, or its politics.
Die nordkoreanische Delegation verließ die Verhandlungen ohne eine Einigung.
The North Korean delegation left the negotiations without an agreement.

North Korean
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North Korean
Relating to North Korea, its inhabitants, its culture, or its politics.
Die nordkoreanische Delegation verließ die Verhandlungen ohne eine Einigung.
The North Korean delegation left the negotiations without an agreement.

The adjective is formed from the country name 'Nordkorea' (North Korea) with the suffix '-isch'. This ending is the most common way to form adjectives from countries and regions.
Wir haben einen Bericht über die nordkoreanische Wirtschaft gelesen.
We read a report about the North Korean economy.
Unlike in English, adjectives derived from geographical names and ending in '-isch' are written in lowercase in German. So it is 'die nordkoreanische Grenze' (the North Korean border), not 'die Nordkoreanische Grenze'.
Die südkoreanische und die nordkoreanische Regierung trafen sich zu Gesprächen.
The South Korean and North Korean governments met for talks.
The adjective is often used in political or geographical contexts. Common combinations are 'die nordkoreanische Regierung' (the North Korean government), 'nordkoreanische Medien' (North Korean media), or 'die nordkoreanische Halbinsel' (the North Korean peninsula).
Die Speisen in diesem Restaurant sind von der nordkoreanischen Küche inspiriert.
The dishes in this restaurant are inspired by North Korean cuisine.
Korean
'koreanisch' and 'nordkoreanisch' can both express a connection to Korea. 'koreanisch' is the general term for Korea, the culture, people, or the language. As 'Koreanisch', it refers to the language. 'nordkoreanisch' is narrower and means only North Korea, its inhabitants, culture, or politics. The words can be confused because they look similar and both are connected to Korea. When it is generally about language or culture, 'koreanisch' is often suitable. When North Korea is meant explicitly, you should say 'nordkoreanisch'.

Im Unterricht lesen wir einen Text über nordkoreanische Politik.
In class, we are reading a text about North Korean politics.
Ich höre gern koreanische Musik beim Lernen.
I like listening to Korean music while studying.