American Defense Secretary Jim Mattis has accused Russiaof trying to influence a planned vote in Macedonia.The vote could open a path for the country to join NATO.Mattis spoke to reporters traveling with himto Skopje, the Macedonian capital.He said he had "no doubt" that Moscow had given moneyto pro-Russian groups to defeat the vote about changing Macedonia's name.A name change would end a dispute with Greece,which has territory of the same name.Greece has repeatedly blocked Macedonia's request to join NATO.Mattis said, "We ought to leave the Macedonian peopleto make up their own minds.''Macedonians will vote on September 30th to decide on the possible name change.In June, Greece and Macedonia agreed that Macedonia would change its name.In return Greece would end its objections to Macedonia's request to join NATO.Other Western leaders had accused Russia of interference in the issue earlier,including the Chancellor of Germany and the chief of NATO.In July, Greece expelled two Russian diplomats accusedof giving money to groups against the name change.Russia objected to the expulsions as baseless.The dispute over the name beganwhen Macedonia gained independence from Yugoslavia in 1991.Greece argued that the use of the name was an insult to Greek history.Officials also said sharing the name could leadto a Macedonian claim on the Greek territory named Macedonia.More than 100 United Nations member-countries recognize Macedoniaofficially as the Former Yugoslav Republic of Macedonia.The vote will ask Macedonians to decideif they want to join the EU and NATO by "accepting the agreementbetween the Republic of Macedonia and the Republic of Greece?"If the majority vote "yes" the countrywill be renamed the "Republic of North Macedonia."