The Trepca mining and metallurgical complex in Kosovo is this Thursday marking its 90th anniversary.

And the head of state, Aleksandar Vucic, said that Serbia would fight for that company "uncompromisingly."

"When an enterprise is cherished and built for 90 years, as is the case with Trepca, that enterprise is no longer just a business entity, it is a part of family and national heritage, a part of tradition," Vucic wrote in a letter to the company's workers, recalling the tradition of mining and the existence of Serbs in Kosovo and Metohija were indelible.

In the letter, read out during a ceremony in the town of Zvecan in northern Kosovo, the president pointed out that Trepca has witnessed great historical turmoils and changing of social orders and political systems, but has survived "all temptations and challenges."

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