Kolkata: One of the reasons for the US's interest in integration of northeast India with southeast Asia is a "lurking concern" about China's looming presence in the region, a political science expert said here on Thursday. "Regional integration (by the US) is seen as a good thing as it will lead to prosperity and greater prosperity means greater trade with the US and the possibilities of American investment," Sumit Ganguly, director, Centre on American and Global Security at Indiana University, told IANS here. "... and it would be dishonest not to say at least one word... a lurking concern about China's looming presence particularly in Myanmar, Thailand and in Bangladesh," Ganguly said here when quizzed on the US interest in linking northeast India with southeast Asia. Ganguly opined China's presence is probably not entirely benign. "If this presence was entirely benign then the US could afford to shrug it off but there is probably something more than completely benign in China's active interest in having possibilities of having bases in Myanmar, increasing Chinese presence in northern Myanmar and Chinese behaviour elsewhere... it is all sort of seamless. That looming shadow does exist," he contended. Ganguly is the co-author of the book "Heading East: Security, Trade, and Environment between India and Southeast Asia" that was unveiled here as a follow up to 'Building Pan-Asian Connectivity Conference' that was held in the city last year. "It highlights both the challenges and the promises that are involved in linking northeast India to the southeast of Asia," he said.