Chaim Weizmann and Ze'ev Jabotinsky supported political activism rather than neutralism. The six possible types of symbiosis are mutualism, commensalism, parasitism, neutralism, amensalism, and competition. In a press conference, Lumumba reaffirmed his government's commitment to "positive neutralism". Realist Challenges to Metaphysical Neutralism, ed. It called for a policy of "positive neutralism" in foreign policy. Privately, however, he was also in favor of neutralism. His hope for continued neutralism availed him no more than it had Sihanouk. John Kotelawala, Prime Minister of Ceylon, however, broke the ice against neutralism. "Categorical Neutralism&colon; Response to Pannier, Sullivan, Seifert, and Ingala," pp. Due to interconnectedness of communities, true neutralism is rare.