China and the Solomon Islands on Monday signed a deal on police cooperation as part of an upgrade of their relations to a “comprehensive strategic partnership”, four years after the Pacific nation switched ties from Taiwan to China.

The police cooperation pact was among nine deals signed after Solomon Islands Prime Minister Manasseh Sogavare met with Chinese Premier Li Qiang in Beijing, underlining his nation’s foreign policy shift.

Sogavare arrived in China on Sunday for his first visit since the two countries struck a security pact last year, to the alarm of the United States and neighbours including Australia.

“In just four years, the relationship between China and the Solomon Islands has developed rapidly, and we can now say that it is very fruitful,” Li told Sogavare.

Sogavare, in turn, thanked China for its role in addressing global challenges including peace and sustainable development. He added that his country had “a lot to learn” from China’s experience.