Afghanistan–Turkmenistan relations
The contemporary borders of the nations of Afghanistan and Turkmenistan are the products of The Great Game in Central Asia between the British and Russian Empires. As a result, the two countries have some cultural ties, with Afghanistan having 1.2 million Turkmen, the third largest Turkmen population behind Iran and Turkmenistan.
Source: Wikipedia — Afghanistan–Turkmenistan relations (CC BY-SA 4.0)