He spent his last two years (1365–67) resisting attempts by King Thado Minbya of Ava to reclaim Toungoo.
He conducted his own foreign policy by forging alliances with the Kingdom of Ramanya in the south; Lan Na in the east; and Taungdwin, also a vassal state of Pinya, in the west.
Kyawswa II died in March 1359 during the latest raid,[9] and the new king Narathu ultimately decided against a two-front war, and left Toungoo alone.
Likewise, Theingaba also left Pinya alone as Narathu struggled to deal with the Maw Shan raids in the following years.
[10] But he watched with alarm as a young Sagaing prince named Thado Minbya emerged to reunify the core regions of Central Burma by September 1364.
Thado Minbya founded the city of Ava in February 1365, and claimed all the former lands of Sagaing and Pinya Kingdoms.
[11] In July 1365, Thado Minbya began his drive to reclaim the southern vassals of Pinya, starting with Pagan (Bagan) and Sagu.
The raid forced Thado Minbya to rush back but it also put Toungoo on the top of the young king's agenda.
Toungoo forces made a valiant stand at Nganwegon but after months of heavy fighting, had to retreat in 1366.