China has made a formal protest after Indian border guards crossed from Sikkim state into its Tibetan territory, China's foreign ministry said Tuesday, accusing them of trespassing.
"Our position to uphold our territorial sovereignty is unwavering," spokesman Lu Kang told a regular briefing, adding China has lodged "solemn representations" with India. 
"We hope that the Indian side can work with China in the same direction and take actions to withdraw the personnel who have overstepped and trespassed into Chinese borders."