Emil Avdaliani writes: The American exit from Afghanistan has created a power vacuum. The quartet of China, Russia, Pakistan, and Iran stands to benefit the most from the US withdrawal. The area to accrue the least benefit is Central Asia, whose five states (Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan), together with Afghanistan, represent one continuous geographical space. Separation would be geopolitically harmful to the Central Asian states, as security spillover from Afghanistan has a direct impact on Tajikistan, Turkmenistan, and Uzbekistan because of their long border.
Russia, China, and the Prospect of US Military Bases in Central Asia (besacenter.org)