places, Shach told his followers in a public statement that it is forbidden to serve in the army, and that "it is necessary to die for this". This is a case, Shach said, in which, halachically, one must "be killed, rather than transgress". This position was expressed in large ads placed in all three of Israel's daily newspapers on May 22, 1998. Shach is quoted as saying that, "Any yeshiva student who cheats the authorities and uses the exemption from service for anything other than real engagement in Torah study is a rodef (someone who threatens the lives of others)", and that "those who are not learning jeopardize the position of those who are learning as they should". Position on territorial compromise Shach supported the withdrawal from land under Israeli control, basing it upon the halakhic principle of pikuach nefesh ("[the] saving [of a] life"), in which the preservation of lives takes precedence over nearly all other obligations in the Torah, including those pertaining to the sanctity of land, though Shach's position was later questioned by Shmuel Tuvia Stern, who wondered why Shach hadn't provided halakhic references supporting his opinion. Shach also criticized Israeli settlements in the West Bank and Gaza Strip as "a blatant attempt to provoke the international community", and called on Haredi Jews to avoid moving to such communities. Shach often said that for true peace, it was "permitted and necessary to compromise on even half of the Land of Israel", and wrote that, "It is forbidden for the Israeli government to be stubborn about these things, as this will add fuel to the fire of anti-Semitism". When Yitzchak Hutner was asked to support this position, he refused, saying that, "agreement to other-than-biblical borders was tantamount to denial of the entire Torah". Chabad and the Lubavitcher Rebbe Shach was undoubtedly the greatest antagonist of Rabbi Menachem Mendel Schneersohn and the only major Lithuanian rabbi to come out in force against the Chabad movement and its leader. From the 1970s onwards, Shach was publicly critical of Schneerson, accusing Chabad of false Messianism by claiming Schneerson had created a cult of crypto-messianism around himself. He objected to Schneerson's calling upon the Messiah to appear, and when some of Schneerson's followers proclaimed him the Messiah, Shach called for a boycott of Chabad and its institutions. In 1988, Shach denounced Schneerson as a meshiach sheker (false messiah), and compared Chabad Hasidim