Israel occupied those areas in the 1967 Six-Day War, and maintains military control of all of them through checkpoints, soldiers and weapons. The 1993 Oslo peace process brought about a division of the West Bank into "A, B and C" areas. The B area (over 400 villages) which amounted to 23 percent of the West Bank and C area, 70 percent (settlements, army camps and state land which used to be cultivated by Palestinian farmers) remained officially under Israeli control, while areas A( the cities) which amounted to only about 3 percent of the West Bank, were ostensibly placed under Palestinian security control. But the Palestinian-controlled areas were tiny islands surrounded by roads and lands that remained under direct Israeli military occupation. And by 2002, during the Palestinian uprising, Israel moved to re-occupy all but one of the major cities that were supposed to be under Palestinian control.
The re-occupation made clear that Oslo's version of Palestinian "control" was incomplete and thoroughly reversible; Israeli military occupation remained in place.