The Nikkei 225 index and the broader Topix index were up 2.2 and 1.6 percent, respectively, when investors in Tokyo took a lunch break.
Shanghai and Shenzhen's composite index were traded around zero, while Hong Kong's Hang Seng was down 0.7 percent.
South Korea's Kospi index pointed to a minus of 0.5 percent and Taiwan's weighted index was up 0.2 percent.
Tokyo's negotiators in the trade talks with the US have announced overnight that the Trump administration has confirmed that certain tariff rates on various Japanese goods will no longer be stacked on top of each other, in accordance with a trade agreement already concluded between the countries.
