The China-Nepal relationship is an "example of relationship between big and small countries based on mutual coexistence and mutual treatment", Chinese Foreign Ministry spokeswoman Hua Chunying told a media briefing here today.
She was responding to a question on the two-day visit of China's State Councillor Yang Jiechi to Kathmandu beginning today.
State Councillor is China's highest ranking diplomat, a post akin to National Security Advisor.
Yang will arrive in Kathmandu after completing his visit to Myanmar.
"The sound and steady relationship between our two countries not only serves them but also regional peace, stability and development," Hua said.
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"The government of Nepal is upholding the One-China policy and always recognises Tibet as an inalienable part of the Chinese territory and does not allow any force to carry out anti-China separatist activities on the land of Nepal," she said.
"We highly commend it and we also hope and believe that Nepal will continue to honour this commitment," she said.
Hundreds of Tibetan refugees live in Nepal which borders Tibet. One Tibetan had committed self-immolation last year there in support of the Dalai Lama.
China's support base in Kathmandu has expanded after Nepal's Maoists headed by Unified-CPN chief Prachanda came to prominence.
Prachanda was one of the early visitors to Beijing this year after change of leadership in China and he met new Chinese President Xi Jinping and other leaders.
Yang's visit will focus on current political situation in Nepal, investments in some development projects and China's security concerns, state-run Xinhua news agency reported.
"Sending a high-level delegation to Nepal shows that China puts Nepal on top of its foreign policy agenda," Tanka Karki, a former Nepalese ambassador to China, told Xinhua.