Recent revelation of China making land reclamation on Mischief Island which form part of the Spratly's had raised the concern of other claimants to the chain of islands.
Leading the charge is the Philippines and Vietnam, both nations who not only distrust the country, but had actually fought against the Chinese military might before; the Philippines while under the aegis of UN during the Korean War while Vietnam during the Sino - Vietnam 1979 border clashes. The Philippines had hoped Malaysia as the current chairman to ASEAN, a regional grouping that Vietnam, Malaysia and the Philippines members would be firmer towards China. However, there were not much noise coming from the recently concluded ASEAN Regional Ministerial Meeting, which was held in KL.
In fact, Malaysia is being seen playing it coyly with China on matters pertaining to South China Sea, even when the People's Liberation Army - Navy (PLA - N) had conducted a naval exercise in the vicinity of James Shoal (Beting Serupai to Malaysian and Zhengmu Reef to China), a rocky outcrop located about 80 nautical miles away from the Malaysian town of Bintulu back in 2013.
This fact is not lost to the Chinese, who had reciprocated Malaysia by giving the country a differential treatment. This has led to PLA conducting a table top military exercise with Malaysia at the end of 2014, with a full fledged military exercise planned for this year. Add on top of it, Chinese Politburo is said to be behind the recent visit of Chinese August One acrobatic team to Malaysia's Langkawi International Maritime and Air Show (LIMA) 2015.
Why does Malaysia, a regional powerhouse in the 90's, choose to pander to China instead of being aggresive towards China's military expansionism in South China Sea? For us to understand this quirkiness, let us first understand the unique Sino - Malay relationship which has been in play since at least 649 AD.