It's well-known how high the stakes are for the United States in Pakistan amid the political crisis and the violence in the Waziristan region but for the first time, there are numbers to show how heavily Washington has invested in Islamabad: the total value of Pakistan’s arms purchase from the US since the war on terror began in 2001 is almost 20% more than the that of the previous 50 years put together.This startling data figures in a report prepared for the US Congress last week based on a study by the US Congressional Research Service (CRS) and raises concerns that the aid Pakistan receives from US under the “war on terror” package may be more suitable for gaining conventional advantage over India.In fact, last year alone, the value of imports was $3.49 billion — the value of total imports from 1950 to 2001 was $3.63 billion.“The rise of Pakistan to its new status as a major arms purchaser from the United States is particularly noteworthy given the difficulties the United States has had with Pakistan since the 1970s over its successful effort to produce nuclear weapons,” the report notes.Analysts say that the report gives voice to a growing concern in Washington over increasing arms exports to the troubled country. More importantly, the report — it was prepared days after Emergency was declared in Pakistan and is directed at giving US lawmakers vital background on key issues — emphasises that US law gives the President the power to terminate arms sales to the country at any point.