"The Taliban's repeated refusal to join talks with the Afghan government contributed to the US decision to take action against Mullah Mansour on May 21," Special US Representative for Afghanistan and Pakistan Richard Olson told a Washington audience.
"Some commentators have speculated that this strike represented a shift in US strategy or a weakening of our commitment to a peace process. It has not," Olson said in his remarks to the Atlantic Council, a top American think-tank.
"The US is not resuming day-to-day combat operations in Afghanistan. The Afghan National Defence and Security Forces have full responsibility, as they should, for providing security in their country," he said.
"Nonetheless, this strike should make clear to all parties in the region that the United States is fully prepared to protect its interests," Olson said.
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"Mullah Mansour was an obstacle to peace, posed a continued threat to US persons through his support for operations against US forces, and was perpetuating a war without end," he said.
"Persistent coordination and cooperation between Afghanistan and Pakistan is also a crucial aspect of long-term regional stability. The United States remains committed to serving as a constructive conduit in advancing these efforts," Olson said.