Ever more diverging Chinese and Soviet strategic and political doctrines had increased Cause_change_of_position_on_a_scale the Sino-Soviet split of the mid-1950s .

North Vietnam had also entered Arriving Laos in the mid-1950s in support of insurgents , setting up the Ho Chi Minh trail to supply and reinforce the Việt Cộng and increased Cause_change_of_position_on_a_scale in 1960 .