Thailand will start building fences along a portion of its border with Cambodia next month to boost security after deadly clashes between the countries erupted last year following long-standing tensions.The first barrier will cover 1.3km (0.8 miles) in Chanthaburi province along Thailand’s eastern border, according to Vithai Laithomya, spokesman of the Royal Thai Armed Forces.The fencing off of the area – a small part of the nearly 800km border between the two nations – was not part of...