2018, total regional spending was increased by 33 percent from $30.8 billion to $41.0 billion (constant 2017 US dollars). The region's share of global arms import increased from 5.8 percent in 1999–2007 to 8.1 percent in the period 1999–2018. China's rising to a regional military power and aggression in the South China Sea was cited as the motive for this period, and countries that are parties to the conflict saw the largest increase. Even though the proportion of military spending to each country's GDP remained constant and still did not fit the definition of arms race, the action-reaction pattern and low trust among the nations with lack of regional dispute resolution mechanisms meaning that there could be a risk of misunderstanding in the future. In official defense policy documents often cited terrorist, armed rebels, pirates, smugglers and organized crime, including humanitarian assistance and disaster relief as the reasons of arms acquisition. However, the acquisition of tanker aircraft, combat aircraft, anti-submarine warfare aircraft, air-to-ground missiles, air defense systems, coastal defense systems, submarines, and surface combat ships, as well as amphibious assault landing ships, were the evidence that the nations perceived foreign threats. The equipment can engage with foreign threat far from home country, and could seen by neighbors as "aggressive." There is also a number of factors, even unreasonable, to arms acquisition, as in the countries with strong military influence in politics. Myanmar's military spending has been decreased after 2015 political reform, but the opposite is true for Thailand after the 2014 coup. By country Brunei The country has its share of military spending relative to its GDP higher than most SEA nations, but fluctuation of oil price means that it had to scale down its spending. Most of its imports were ships and naval weapons. Cambodia Between 2009 and 2018, Cambodia increased its military spending every year. Amount to $525.1 million in 2018, the spending accounted for an average of 2.1 percent in 2015–18. A border issue with Thailand in 2008 and 2011 is the motive. Moreover, increased political influence of the military since 2017 may likely also played a role. The country's military inventory did not change much during the period, only to replace decommissioned weapons. By 2018, the country had shifted more to land weapons, although it is subjected to change in the future. Indonesia Indonesia saw the necessity to modernize its armed forces from Communist takeover of