The Taliban began a resurgence due to several factors. At the end of 2014, the US and NATO combat mission ended and the withdrawal of most foreign forces from Afghanistan reduced the risk the Taliban faced of being bombed and raided. In June 2014, the Pakistani military's Operation Zarb-e-Azb, launched in the North Waziristan tribal area in June 2014, dislodged thousands of mainly Uzbek, Arab and Pakistani militants, who flooded into Afghanistan and swelled the Taliban's ranks. The group was further emboldened by the comparative lack of interest from the international community and the diversion of its attention to crisis in other parts of the world, such as Syria, Iraq, Yemen, Ukraine, Libya, Nigeria, and Somalia. Afghan security forces also lack certain capabilities and equipment, especially air power and reconnaissance. The political infighting in the central government in Kabul and the apparent weakness in governance at different levels are also exploited by the Taliban. In May 2015, Russia has closed a key military transport corridor which allowed NATO to deliver military supplies to Afghanistan through the Russian territory.