Yeah, I've ever watched news on TV that reports those kinds of problems between Korea and Japan.
Not really, Indonesians can't basically speak in both languages even though they had ever colonised us. But Japanese is one of the most popular foreign languages to learn here and I think Japanese and Dutch colonisation were completely different compared to British colonisation that obligated the people of its colonial regions to learn english and guaranteed their welfares. As you can see, the people of former british colonisation countries such as Canada, US, Australia etc. can mostly speak english and have better welfares.
Honestly there were some European nations that colonised us too, such as Portuguese, Spanish and British but the most dominant were Dutch and Japanese.
*For your Information, There is a village here which is exactly located in Sulawesi Island whose the people use Korean as their native language.