"Based" means "true to yourself" and implies a kind of mobilizing integrity, an integrity that leads to action.  The pinions of Trump's foreign policy were developed over decades of New York real estate, construction, and business competition, as well as a bit of Hollywood, and a lifetime of sleeve-worn patriotism. The influence of a smart, entrepreneurial wife and ex-wife, who grew up under, and later escaped, European totalitarianism, socialism and communism cannot be under-estimated.

It looks like old style realism, a bit of Thucydides' Melian Dialogue, where we hear, "…the strong do what they can and the weak suffer what they must." Increasingly frantic screams from neoconservatives, left-globalists, and the uni-party cartel about a realistic peace in Ukraine bear this out.

Trump's major foreign policy actions so far have mainly been a show of US "strength" with an accurate recognition of where weakness resides.  Tariffs in bilateral trade; re-engagement with Russia to end the NATO-Russia war in Ukraine and pull Russia from a Chinese orbit; forcing Netanyahu, pre-inauguration, to agree to (but not necessarily to comply with) a Gaza cease-fire; grandly launching a new Monroe Doctrine; and a possible outlier, giving his public stamp of approval to a longtime Zionist plan for permanent elimination of Palestinians from Gaza and the West Bank.  Other decisions also fit:  Trump's immediate crackdown on illegal immigration; demands for regional cooperation to end the illegal drug trade; and requesting (again) a troop withdrawal from northwestern Syria that should end US military protection for Conoco's illegal drilling there.