Has the US President ever been denied entry to a foreign country?

Shortly after the awarding of temporary asylum to Edward Snowden by Russian President Putin, the relationship with the US President became contentious, to the extent that it was announced that the two Presidents would not meet at a prescribed summit. This may or may not have happened to occur; it may have just been sabre-rattling.

My question: Barring warring countries, has any country denied entry to the US President due to a legal, political, or similar type of dispute? What was the dispute, and with whom?