European Union foreign affairs chief Federica Mogherini and U.S. Assistant Secretary of State for European and Eurasian Affairs Wess Mitchell plan to be there Thursday.
U.S. Defense Secretary Jim Mattis has a weekend stop planned. The referendum on changing the country’s name to North Macedonia is scheduled for Sept. 30.
Greece has a region named Macedonia, and said the use of the same name by the small former Yugoslav republic to its north could imply a claim to the territory and ancient heritage of the Greek province.
The Macedonian government, led by center-left Prime Minister Zoran Zaev, launched its referendum campaign earlier this week, urging people to support the new name. Zaev negotiated the agreement with the Greek Prime Minister Alexis Tsipras.
Macedonia’s conservative opposition vehemently opposes the agreement with Greece, saying it was a national humiliation.
The opposition leader, Hristijan Mickoski, reiterated those objections Wednesday but told supporters to vote “with their conscience.”
Westerns governments have been vocal in their support of the deal. NATO Secretary General Jens Stoltenberg, Austrian Chancellor Sebastian Kurz, and German Chancellor Angela Merkel were in Macedonia’s capital, Skopje, last week to urge voters to support the name change.
Russia denies claims of interference, but openly opposes NATO expansion eastward.
Kosovo’s President Hashim Thaci endorsed the “yes” campaign at a meeting with Zaev, saying the referendum was “an historic moment that needs to be seized.”
AP Writer Derek Gatopoulos contributed from Athens, Greece
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