GENEVA — Switzerland said Monday that Israel has been violating international law in its Gaza offensive by heavy destruction and endangering civilians in acts of collective punishment banned under the Geneva conventions on the conduct of warfare. "A number of actions by the Israeli defense forces in their offensive against the Gaza Strip have violated the principle of proportionality and are to be seen as forms of collective punishment, which is forbidden," the Swiss Foreign Ministry said in a statement. "There is no doubt that Israel has not taken the precautions required of it in international law to protect the...