Why did Japanese loanwords not become fully established in South Sakhalin Nivkh?

Japanese loanwords did not become fully established or acculturated in South Sakhalin Nivkh because the Japanese hegemony over South Sakhalin ended after 1945. While the language was receptive to potential Japanese borrowings during the first half of the 20th century, the cessation of Japanese political and social influence prevented these terms from becoming a permanent part of the language's vocabulary.1