Taqiyya is of fundamental importance in Islam. Practically every Islamic sect agrees to it and practices it ... We can go so far as to say that the practice of taqiyya is mainstream in Islam, and that those few sects not practicing it diverge from the mainstream ... Taqiyya is very prevalent in Islamic politics, especially in the modern era.
Raymond Ibrahim quoting Sami Makarem / Wiki/
also
"The authoritative Encyclopaedia of Islam, for example, simply states: “[T]here can be no question of genuine peace treaties [between Muslims and non-Muslims]… only truces, whose duration ought not, in principle, to exceed ten years, are authorized. But even such truces are precarious, inasmuch as they can, before they expire, be repudiated unilaterally should it appear more profitable for Islam to resume the conflict”-that is, if the opportunity to do “something better” presents itself."
..
"Moreover, the main point of my essay was not to demonstrate that Islam permits deceit during war-a phenomenon I indicated also prevails among many non-Muslim strategists as well-but to show that, for Islam, warfare with non-Muslims is eternal, “until all chaos ceases, and all religion belongs to Allah (Koran 8:39). Yet no one wrote denying this classical Islamic formulation of the world into Dar al-Harb and Dar al-Islam, which must be in perpetual war until the latter subsumes the former."
quite fascinating
https://www.raymondibrahim.com/2009/02/26/taqiyya-revisited-a-response-to-the-critics/