BELGRADE, Serbia (AP) — Serbia's prime minister pledged on Friday that the Balkan country will never join NATO or any other military alliance as Serbia marked the 18th anniversary of the start of NATO airstrikes that stopped its crackdown in Kosovo. Aleksandar Vucic spoke at a ceremony near a railway bridge in southern Serbia where the Western military alliance's missiles struck a passenger train, killing at least 28 people and injuring dozens.