Automobiles and car parts comprise 60 percent of the roughly ¥150 billion ($1.38 billion) a year in Japanese trade affected by the protracted trade war between the United States and China, a source familiar with the matter has said.

The ¥150 billion involving Japan firms is part of some ¥70 trillion total trade between Washington and Beijing in 2018, the source said Wednesday, citing a Japanese government survey.

To mitigate the impact of the prolonged dispute between the world's two largest economies, some Japanese companies, across industries, have moved their production bases to Southeast Asian countries or Mexico, or have stepped up domestic production and sales, the source said.