In multiple and mounting ways, from aid to trade to diplomatic protection, China keeps its geopolitical ally Cambodia afloat. That patron-client relationship was on full display late last month when Cambodian Prime Minister Hun Sen made a hat-in-hand four-day state visit to Beijing. The leader came away with what he sought: More money, more promises and more comradely assurances. Beijing reportedly pledged to provide Cambodia with US$588 million in aid over the next three years, to import 400,000 tons of rice, increase bilateral trade from $5.7 billion last year to $10 billion in 2023, and broadly more investment.