Jackson Diehl has a theory:
 I recently asked several senior administration officials, separately, to name  a foreign leader with whom Barack Obama has forged a strong personal relationship during his first year in office. A lot of hemming and hawing  ensued.
The hemming and hawing which ensued points to the fact that this president has done nothing to forge those sorts of “strong personal relationship[s]” that are so necessary to moving a country’s foreign policy forward.  Diehl points to a few suggestions from the administration officials of foreign leaders with whom Obama may have a “strong personal relationship”.  Diehl’s examination of each finds the claim to be unlikely.  Unsurprisingly one who isn’t suggested is Britain’s Gordon Brown.