Softbank's press release [0] mentions that a total of 11 countries were affected by the outage. I can't seem to find any information on what other countries were affected though.
[0] https://www.softbank.jp/en/corp/group/sbm/news/press/2018/20...
[0] https://www.softbank.jp/en/corp/group/sbm/news/press/2018/20...
[1] (link in Vietnamese) https://congnghe.tuoitre.vn/ericsson-xin-loi-ve-su-co-sap-nh...