The Panjdeh incident in 1885 was the next major event in the history of Afghan-Russian relations. Once again, the British-Russian rivalry boiled over after Russia seized several oases from Afghanistan. The British threatened war, but the nations made an agreement in 1887 establishing a buffer zone in Central Asia. In the Anglo-Russian Convention of 1907, the Russian Empire and British Empire divided up spheres of influence, with Russia agreeing to concede Afghanistan to the British side, in exchange for Central Asia and northern Iran. Afghanistan was neutral in World War I, despite the Niedermayer–Hentig Expedition by the Central Powers.