Protesters blocked roads and their sheer numbers overwhelmed the Bahrain police. The government of Bahrain requested help from neighbouring countries. On 14 March, the Gulf Cooperation Council (GCC) agreed to deploy Peninsula Shield Force troops to Bahrain to secure key installations.
By 2014, 5,000 Saudi and Emirati forces were positioned "less than 10 miles from the Pearl Roundabout, the center of the country's protest movement".
Bahrain's strategic importance to Saudi Arabian government is originated from economic, sectarian and geopolitical reasons.
The real purpose of the intervention was to stop "a growing rebellion by the kingdom's majority, but deprived ... Shia citizens" by taking all necessary measures. Death of an Emirati policeman, Tariq al-Shehi, made it clear that the foreign troops were in fact involved in suppressing protests. According to Nuruzzaman, the most important factor leading to Saudi's intervention in Bahrain, is "the domino effect of Bahrain's fall into Shia hands". Concerned about their own Shia population and fearful of democratic change, Saudi king Abdullah sought to reverse the pro-democracy movements in his neighbor countries using force. Saudi Arabia maintained that the cause of unrest in Saudi's eastern province, is the Shia uprising in Bahrain. According to Steffen Hertog, a Saudi Arabia expert at the London School of Economics and Political Science, Saudi's move was a signal to Shia movements in the Eastern Province to express how seriously Saudi intended to crack down the unrest. Moreover, keeping Al-Khalifa, "the key conservative Sunni ally of Saudi", in power was of notable importance to Saudi to avoid the spread of Iran's influence in west of Gulf. Saudi Arabia acted through GCC to mask its "strategic concern" about Iran and its influence.
The intervention was apparently carried out with the aim of guarding Bahrain's oil infrastructure. The two kingdoms have strong economical ties and Saudi Arabia had made significant investments in Bahrain's tourism, infrastructure and industry. Saudi Arabia, Bahrain's largest trading partner, sent troops to Bahrain to pursue some economic goals and among the important factors leading to sending troops to Bahrain were "the possibility of the loss of oil fields, terminals and crude processing plants, the loss of investment and future investment prospects". Moreover, any spill over of Bahrain's unrest into the neighbor kingdom would "upend" global oil markets.
Primarily interpreted by analysts "in terms of domestic and regional political and strategic dynamics", the intervention has created serious regional and global concerns and has turned the uprising into a regional cold war. Among other factors, the foreign military intervention may drive the sectarianism. According to Foreign Policy magazine, the intervention marked "a dramatic escalation of Bahrain's political crisis."
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