solve for X

[calimac]

Here is a quotation from a book I've been reading, about world leaders, with the names removed. Your riddle is, who is X?

A lamented that 'X is behaving just like a spoilt child, and it is difficult to know how to deal with him'; as B had warned, the more X asked for, the more he got, and the greater became his demands. He was not a spoilt child, merely an avaricious and now overweeningly self-confident and cynical brigand.

Sound like anybody we know?