The bilateral relation between Nepal and China has been friendly and is defined by the Sino-Nepalese Treaty of Peace and Friendship signed on April 28, 1960 by the two countries. Though initially unenthusiastic, Nepal has been of late making efforts to increase trade and connectivity with China. Relations between Nepal and China got a boost when both countries solved all border disputes along the China–Nepal border by signing the Sino-Nepal boundary agreement on March 21, 1960 making Nepal the first neighboring country of China to agree to and ratify a border treaty with China. The government of both Nepal and China ratified the border agreement treaty on October 5, 1961. From 1975 onward, Nepal has maintained a policy of balancing the competing influence of China and Nepal's southern neighbor India, the only two neighbors of the Himalayan country after the accession of the Kingdom of Sikkim into India in 1975. In recent years, China has been making an effort to gain entry into SAARC, and, Nepal has continuously backed and supported the proposal to include China as a member in the regional grouping. Since 1975, Sino-Nepalese relations have been close and grown significantly, though India remains the largest source of Foreign direct investment (FDI), and the largest source of remittance after Qatar. Based on the amount of remittance to Nepal sent by Nepalese migrants working in India (amounting to nearly $0.8 billion per year), the government of Nepal estimate that there are around 1 million Nepalese migrant workers in India while the number of Nepalis in China is minuscule (3,500 in Mainland and 15,950 in Hong Kong) as of 2017.