Thailand said on Friday it will join a UN arbitration process chosen by Cambodia to resolve a festering maritime boundary dispute, but put on hold for now other two-way efforts to settle their contested borders.This week Cambodia launched a compulsory conciliation process under the United Nations Convention on the Law of the Sea (Unclos), after Bangkok decided last month to unilaterally end a 2001 framework pact for talks on a disputed maritime belt.For more than 25 years, both have claimed...