While Kotlin is a Russian island the Kotlin programming language was created by JetBrains which is a Czech company founded by Russians with headquarters in Prague. You will find Kotlin on the map in the Prague circle.
Notably, Roman Elizarov who was leading the Kotlin team and who is based in St. Petersburg actually left Jetbrains. It's not clear why; at the time he cited personal reasons. But reading between the lines, it could be because he was not able or willing to leave Russia.