China's just-completed conference touting its Belt and Road  initiative certainly looked like a triumph, with Russian President  Vladimir Putin playing the piano   and Chinese leaders announcing a string of potential deals and massive  financial pledges. Underneath all the heady talk about China positioning  itself at the heart of a new global order, though, lies in  uncomfortable question: Can it afford to do so?   Such doubts might  seem spurious, given the numbers being tossed around. China claims  nearly $900 billion worth of deals are already underway, with estimates  of future spending ranging from $4 trillion to $8 trillion, depending on  which Chinese government  agency