Obama has proven to be a total failure at applying any sort of economic pressure to Israel to fulfill its obligations on Resolution 242 and others. But when Iran is suspected of simply aquiring the technology for nuclear weapons, he doesn't hesitate to impose even tougher sanctions. One can easily see the same pattern with regard to this presidency. They coddle their allies while calling for more punishing measures against their adversaries even though these measures have proven to be a failure.
Palestinians report IDF airstrikes on Islamic Jihad targets in southern Gaza Strip (Haaretz)
from the article: Obama: Israel should sign nuclear non-proliferation treaty