My Brit neighbor refers to those from China to Thailand,
Viet Nam, Japan, etc as “Oriental”, and those from the Middle East and Indian subcontinent “Asian”.
Your Brit neighbor is only half correct.
Asia is the largest continent, includes Japan to Turkey Japan from East to West and Siberia to Sri Lanka North to south.
So they are all Asians. Asian is not a race, it is a geographical description. “Oriental” is a race which includes people from Japan, China, all the way down to Indonesia. “Asians” can be of any 3 main races.