By Orhan Coskun and Jonathan Spicer ANKARA (Reuters) – Talks between Turkish officials and delegations from Sweden and Finland this week in Turkey made little headway overcoming Ankara’s objections to the Nordic countries joining NATO, and it is not yet clear when further discussions will take place, according to two sources. “It is not an easy process,” a senior Turkish official told Reuters on Friday. “They need to take concrete steps that will be difficult. Further negotiations will continue. But a date doesn’t seem very close.” Finland and Sweden formally applied to join NATO last week to …