PHNOM PENH, Cambodia (AP) — Chinese Foreign Minister Wang Yi arrived in Cambodia on Sunday for a three-day official visit to reaffirm ties with Beijing’s closest ally in Southeast Asia. His visit is the last stop on a three-nation regional swing that also took him to Indonesia and Papua New Guinea.

He is visiting amid foreign concerns about two big Chinese-funded projects in Cambodia — a planned canal and a naval base — that critics allege could aid Beijing’s strategic military interests in Southeast Asia.

China is Cambodia’s most important ally and benefactor, with strong influence in its economy. That is illustrated by numerous Chinese-funded projects — particularly infrastructure, including airports and roads, but also private projects such as hotels, casinos and property development. More than 40% of Cambodia’s $10 billion in foreign debt is owed to China.