 These treaties have long been regarded by Chinese as unequal treaties, and the issue partially arose again with the Sino-Soviet split, with tensions eventually leading to division-scale military clashes along the border in 1969.Even as tensions lessened and leaders on both sides adopted more conciliatory attitudes, the border issue remained unresolved.Despite their view of the previous border treaties as unequal ones, Chinese leaders were willing to negotiate on the basis of the modern boundaries.