NEW DELHI — The India-China relationship has entered choppy waters due to a perceptible hardening in the Chinese stance. Anti-India rhetoric in the state-run Chinese media has intensified, even as China has stepped up military pressure along the disputed Himalayan frontier through cross-border incursions. Beijing also has resurrected its long-dormant claim to the northeastern Indian state of Arunachal Pradesh, nearly three times as large as Taiwan.

The more muscular Chinese stance clearly is tied to the new U.S.-India strategic partnership, symbolized by the nuclear deal and deepening military cooperation. As President George W. Bush declared in his valedictory speech, "We opened a new historic and strategic partnership with India."

The Obama administration, although committed to promoting that strategic partnership, has been reluctant to take New Delhi's side in any of its disputes with Beijing. This has emboldened China to up the ante against India, with the Chinese Foreign Ministry employing language like "we demand" in a recent statement that labeled the Indian prime minister's visit to Arunachal Pradesh a "disturbance."