Though I disapprove of your suggestion that "a metrical approach" might help to clarify the "definitional vagueness" of the matter at hand upon which the original post insists--and which seems to be the only point of the post, leading me to suppose it only a sort of prefatory note, wherein the author is either paying his reverent due to the simultaneous possibility and impossibility of obtaining agreement (which impossibility is currently afflicting and undermining, perhaps undoing, the Western political and ethical order, with its teleology of expanding itself world without end) rooted in rival understandings of the meaning and significance--as well as rival valuations--of motivating ideals; or (or and/or): the author is laying the ground for dubiety of any "definite" position on the subjects of "militarism" and "interventionism" so that he may lightly esteem any conviction on these matters (other than his own?), on the grounds of their insufficiency vis a vis the unnavigable swirl of language (in either or both events, anticipate the customary obscurantism)--I found your (that is, bob's) citation of the Turkish experience of a militarism for the sake of Westernization to be interesting.

Turkey's Westernizing militarism being necessary in this case, and meaning here something like an intimidating degree of the possibility of applying coercive force, presumably because integration into the Western political and ethical order is/was so profoundly alien to the historical spirit, essence and/or existence of the Turkish people that it required threatening gestures of prospective violence to enact--"until it didn’t", as you say, meaning that, with the coming of a sort of live democracy to the Turks around the turn of the century--not the "liberal" sort, but rather more the classical, illiberal kind--it didn't take long for Turkey's populists to begin to unwind, unravel and undo Turkey's Westernizing orientation--a phenomenon that seems to be getting underway in the West as well. As it turns out, the Western political and ethical order in its liberal democratic phase is proving to be deeply alienating to all peoples, including its own.

That Western political establishments tended uniformly to approve of Turkey's militarized, forced integration into the liberal democratic order of the West suggests that Western elites are, pace liberalism per se, ultimately less interested in (what they cognize to be) ethical means than they are in (what they cognize to be) ethical ends. Even now, at the "end" of (the Whig interpretation of) history, it is, as ever, the ends that justify the means--an antithesis of political philosophic liberalism and which evokes perhaps the simple "befallen-ness" of this international political order and the consequent impossibility of "managing" it by means of human choice(s) or intention. The forced liberalization of a people gradually elicits either organized and determined resistance or, perhaps, a debilitating exhaustion, while the liberalization of a people along more "consensual" lines seems to eventuate in the exact same result. Either way, ongoing "liberalization" would seem to deconstruct or "unbuild" itself. That which befalls, in course or path of time, withdraws.

...the US approach which is perhaps to see the entire world as its “living space”.

This does seem to be "the US approach" and it poses vast problems for the peoples of the earth. They must either fight (militarize?) in order to secure the existence of their people and a future for their children, or they must essentially vanish into the anti-world oblivion of the U.S./Western administrative grid of techno-capitalism. Either way, hardship and harm beckon.