The ties have soured further since March, when Germany, the Netherlands and some others moved to bar Turkish cabinet ministers from addressing Turkish immigrants ahead of the April 16 referendum on constitutional changes in Turkey.

The EU has been accusing Turkey of growing authoritarianism, violations of the rule of law and crackdown on dissidents and the media particularly following last July's failed military coup.

Turkey, for its part, accuses the 28-nation bloc of protecting terrorists like the PKK.

Officials from both sides have even started to talk about the possibility of ending Turkey's negotiations on joining the union.

The EU will be the global actor with which Erdogan will have the most problems in the coming days, maintained Dilek, a former Turkish staff officer.

He argued that it is quite possible that uncertainties in Turkish foreign policy may be the rule from now on due to the emergence of a one-man rule as the referendum greenlights a stronger executive presidency.

The analysts feel that the series of meetings Erdogan will have with the world powers is important for Turkey, yet they have misgivings about whether Turkey could profitably use them given the country's increasingly negative image in terms of democracy and the dubious character of the referendum, which both the Turkish opposition and European bodies say was rigged with malpractices.

"These visits are extremely important, because they are taking place in a period when Turkey's options are diminishing," Yakis told Xinhua.

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