Why did Japan restrict chip smartphone materials (fluorinated polyimide, resist, and hydrogen fluoride) exports to South Korea?

https://www.quora.com/Why-did-Japan-restrict-chip-smartphone-materials-fluorinated-polyimide-resist-and-hydrogen-fluoride-exports-to-South-Korea/answer/%E6%A1%91%E7%94%B0-%E5%81%A5%E5%8F%B8-Kuwata-Kenji?prompt_topic_bio=1

Will it be helpful?
https://www.meti.go.jp/english/press/201/0701_001.html