In yet another incident of Chinese incursion, about 250 soldiers of China's Peoples Liberation Army entered Arunachal Pradesh's eastern district of Kameng four days ago, defence sources said on 14 June.
The "temporary transgression" by the Chinese patrolling party occurred in Yangste, East Kameng district on 9 June, they said, adding that the soldiers went back within hours.
Significantly, the Chinese crossing-over occurred at a time when Beijing had hardened its opposition against India's bid for membership of the 48-member Nuclear Suppliers Group (NSG)
This is the first known transgression by the Chinese army this year in the region, which China claims is part of its territory.
The Chinese troops spent about three hours on this side of the border before going back to their territory, the sources said.