For starters, the Sino-USSR split was in the early 1960's, when the former-USSR adopted the anti-China position. Second, the import was coming from Australia, which established the formal diplomatic relation with China in 1972, the same year as Japan and West Germany.
The reason former-USSR was targeted was because the late-Field Marshal Lin Biao of the People's Liberation Army tried to assassinate Chairman Mao and tried to flee to former-USSR when he failed. Due to this, the former-USSR was selected instead.
The reason former-USSR was targeted was because the late-Field Marshal Lin Biao of the People's Liberation Army tried to assassinate Chairman Mao and tried to flee to former-USSR when he failed. Due to this, the former-USSR was selected instead.