FOR Ministry of External Affairs officials, it is back to the diplomatic minefield. Soon after the US Senate passed the Brown Amendment authorising the $368million arms package for Pakistan, the Americans dispatched Deputy Assistant Secretary of State for South Asian Affairs, E. Gibson Lanpher, to New Delhi and Islamabad. His primary mission was to soothe ruffled Indian feathers and to assure South Block that the Hank Brown Amendment notwithstanding, the Clinton Administration attaches much importance to Indo-US relations.