No Middle Ground
Analysis of aggressive new American foreign policy outlined by Bush administration; nations of world are given stark choice: stand with US against terrorism and deny safe havens to terrorists or face certain prospect of death and destruction; senior officials cast aside niceties of diplomatic language and military restraint that US manifested in dealing with past terrorist attacks; they now talk of campaign that could involve American forces in protracted fighting against countries like Afghanistan, Iraq, Sudan and even Pakistan, which occupies vital strategic position south of Afghanistan, where Osama bin Laden is believed to be based; by equating acts of terrorism and even harboring of terrorists with acts of war, administration is going well beyond traditional international practice, saying in effect that there are no neutral states and no clear geographical confines; photo (M)