P16b CJJFBX 262 Sun 28 May 01:17/21 )|l4|l4|,  -n2n2  -/.%/.I/,  WORLD  UV TROOPS TOLD TO HOLD THEIR GROUND UN sources have sbid NATO air power could still bj called upon if Bosnian Serbs fire on peacekeepers guarding arms storage depots. A UN spokesman said commander of peacekjipjrs Lt-Gen Rupert Smith had ordered his troops to fight any Serd attempts to see:j the depots. NATO earlier authorised "additional means" to protect UN troops. 161 The Bosnian Serbs have said they plan to hold their UV hostages indefinitely despite a demand from NATO for their immediate release.  Next News World Diary TV/Radio