Updated

Montenegro has urged Serbia to arrest and extradite two Serbs for their alleged involvement in a pro-Russian plot to overthrow the small Balkan country's government.

Montenegrin Justice Minister Zoran Pazin told the Dnevne Novine newspaper Wednesday that Serbia has an obligation to "arrest persons sought by Interpol without setting any conditions."

Montenegro has issued an international arrest warrant for two Serbs and two Russians for alleged "terrorist" activities that included plans to kill the country's prime minister and take over Parliament on election day in October.

The Kremlin has denied involvement, but has actively supported local groups that oppose having Montenegro, a traditional Slavic ally, become the 29th member of NATO.

Some 20 people are in custody in Montenegro over the alleged coup scheme.