"The fragmentation of industrial and supply chains has deepened, and trade barriers have increased, which has had a great impact on the economic development of all countries," state news agency Xinhua reported on Sunday, citing Li. 

China is studying new policy tools, including some "unconventional measures", which will be launched as the situation changes, the Chinese premier said.

Li also said China will continue strengthening economic cooperation with more countries to support the overseas business development of Chinese enterprises.

Huawei, SAIC Motor and New Hope Group were among the Chinese companies at the symposium.

Li is on a three-day visit to Indonesia until Monday and will then travel to Malaysia for the ASEAN-GCC-China Summit.

On Sunday, Li warned the rise of "unilateralism and protectionism" could threaten the global economic and trade orde.

"Unilateralism and protectionism are on the rise globally, posing a serious threat to international economic and trade order," Li told President Prabowo Subianto on Sunday, according to Xinhua state news agency.

"In the face of these risks, unity and cooperation are the only viable path forward."

Beijing and Jakarta are key economic allies, with Chinese companies pouring capital into extracting Indonesian natural resources in recent years, particularly in the nickel sector.

But the two countries' disputed claims into the strategic waterways of the South China Sea and its nearby territories have weighed on their relationship in recent years. 

Li said Beijing was keen to further advance cooperation with Southeast Asia's largest economy. 

"China is ready to work with Indonesia and other developing countries to... uphold multilateralism and free trade, and advance a multipolar world and inclusive globalisation," Li said.

Prabowo also lauded Indonesia's "close and good" friendship with China.

"Indonesia is ready to create a safe and prosperous region. Indonesia is ready to strengthen cooperation with China for us to create a peaceful region, which is safe for all," the Indonesian leader said.

Prabowo and Li oversaw the signings of several agreements, pledging closer cooperation in areas including economic development and finance.

The presidential palace later announced that eight other agreements were signed in sectors covering tourism, health, investment and media. 

The Chinese premier is headed next to Malaysia for an ASEAN summit between members of the 10-country bloc, China and oil-producing countries. 

Prabowo had visited Beijing last year, during which Chinese President Xi Jinping told him that he hoped for a "new chapter" in bilateral relations.