Albanian Foreign Minister Besnik Mustafaj resigned from the post saying he was tired after an intensive period of work in the last 20 months.
"I presented (my) unrevoked resignation to Prime Minister (Sali) Berisha," Mustafaj said at a news conference.
"I am tired. Tiredness is a reasonable motive," he replied when asked on the reason for his suprise resignation.
Mustafaj has been involved in intensive diplomacy on the future status of Kosovo, including visits to the United Nations in New York and numerous European capitals.
He has held the job since the centre-right coalition Democratic Party government of Prime Minister Sali Berisha took office in September 2005.
His last diplomatic mission was at a regional meeting on NATO integration in neighboring Ohrid, Macedonia.
One hundred years ago today ended the most grueling of wars involving disgusting conditions for soldiers and at least 17 million deaths. We learnt nothing.
Russia has been developing an energy module on the basis of the megawatt-class nuclear power plant since 2010. The spaceship needs neither sunlight nor solar batteries