Some additional pertinent information I located on the internet:
In the prelude to the Yom Kippur War of 1973, Egypt moved anti-aircraft missiles close to the Suez Canal, despite a commitment not to do so. Israel chose to ignore the move, and the result was catastrophic, when the missiles shot down numerous IAF jets after war broke out.
The Israeli government has asked Egypt to withdraw the armored vehicles it deployed in Sinai 11 days ago, in contravention of the peace treaty between the two nations, according to Al-Quds Al-Arabi, which quotes Israeli sources.
Israel said that the deployment of armored forces in the El Arish area was only reported to it retroactively by Egypt, after the forces had already been deployed. Once Egypt supplied Israel with the full details about the extent of the deployment, the Jewish state asked Egypt to withdraw its armor from northern Sinai.