evidence: China also claims the Indian state of Arunachal Pradesh, where the tunnel was constructed, as its own, even as the area has long functioned as Indian territory. [...] "We require the Indian side to cease any action that may complicate the boundary question … the Chinese military remains highly vigilant and will resolutely defend national sovereignty and territorial integrity," a Defense Ministry spokesperson said last week, using the Chinese name "Zangnan" or South Tibet to refer to Arunachal Pradesh. [...] Modi on Friday also traveled to Bhutan for a trip "aimed at further cementing the India-Bhutan partnership," he wrote on social media platform X. The remote Himalayan country bordering Arunachal Pradesh too has a contested border with China, and New Delhi has been wary of a potential settlement between leaders there and in China over that dispute.