BEIJING — Indonesia’s new leader called for collaboration rather than confrontation with China after the signing of $10 billion in new deals at a business forum on Sunday in the Chinese capital before heading to the U.S.

President Prabowo Subianto told the forum that his country wants to be part of China’s emergence as not only an economic but also a “civilizational power.”

“We must give an example that in this modern age, collaboration — not confrontation — is the way for…