The blockade kept Hamas controled and less likely to try and overthrow Abbas & taking over Judea and Samaria. Obama knew this and it provided a scapegoat suddenly Hamas were the only ones who were against the peace process. If either of them had been against the blockade they would have said so and demanded Israel lift it long ago not just as a knee jerk reaction in Abbas case to condemn Israel and Obamas because it had to look like he was doing something. Bibi even got permission from Obama before giving the go ahead for the operation of boarding the ships. So looks like Obama was quite happy for Israel to enforce this blockade. Before the incident on the ship no arab state has ever demanded the blockade be lifted they didn't care about Gaza. The Europeans are the only ones who have ever been united in opposition to the Gaza blockade which is why Israel has been able to keep this blockade in place for so long because neither the US or the arabs have ever been openly against it. Abbas though is now showing what a hypocrite he really is, the other day he was demanding the blockade be lifted and threatening the storm the border to liberate Gaza now he is saying he is against lifting it.
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from the article: Abbas to Obama: I'm against lifting the Gaza naval blockade