"But I knew that what had happened was an eye-opener not only to the United States but also to Pakistan, who realized that after what has happened on the 11th of September, it was simply impossible to continue to play those games in Afghanistan"

This quote by Lakhdar Brahimi is describing the events of September 11th, 2001, when terrorists attacked the United States. The quote suggests that this event was an eye-opener for both the United States and Pakistan, as it showed them that it was no longer possible to continue playing games in Afghanistan. This suggests that the two countries had actually been associated with some kind of political game in Afghanistan prior to the attack, which the attack made them understand that this was no longer a choice. The quote recommends that the attack had an extensive effect on both nations, which it changed their technique to Afghanistan. It likewise implies that the attack had a significant impact on the region, as it showed the two countries that they might no longer ignore the scenario in Afghanistan.