What is the best way to repair a basement cinder block wall that is buckling in. From the inside or outside.?

I'm having the basement waterproofed on the inside of the house where they remove the cement floor 18"-20" around the perimiter. After taking down panelling from a wall which leaks, the block is collapsing & there are huge cracks. Would it be easier to fix this problem from the inside or outside of the house? Thank you.

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