'unprovoked aggression' is correct and usable in written English.
It can be used in a variety of contexts to refer to a hostile action without a prior cause or justification. For example: "The country condemned the unprovoked aggression of its neighbor."
The destruction was simply an act of unprovoked aggression.
The victors were victims of unprovoked aggression by the Axis powers and had to fight an unlimited war to survive and ultimately prevail.
This grassroots, local-leader movement represents a defensive strategy in what is being now tacitly recognized as unprovoked aggression against an entire nation, and an entire people.
Today's demonstration is a reminder that what was a war of unprovoked aggression a year ago has not been changed by victory.
While the committee described a catalogue of errors, it was attacked for absolving the Thatcher government from "any criticism or blame" for the junta's decision "to commit an act of unprovoked aggression".
In the India-Pakistan War, while we and our new associates in Peking hold Pakistan to be a victim of unprovoked aggression, the Soviet Union champions & to a considerable degree equips India.
Those who perpetrate unprovoked military aggression, for example, are criticized for the "disorder" in how they distinguish righteous (yi) from unrighteous (Book 17, "Condemning Aggression").
No one from the Pentagon is saying anything, the MILF claims it is not hiding any Pentagon members and is just defending itself against unprovoked army aggression.
In dramatically lowering the threshold for pre-emptive attack, he undermines the civilized world's consensus against unprovoked transborder aggression, a principle central to international law (and to his father's rationale for the Persian Gulf war).
The book convincingly challenged the conventional wisdom in India and the West that it was a war of unprovoked Chinese aggression, and argued that much of the fault lay with Indian policy.The report is still classified as top secret, and the government still refuses to release it.
They condemned unprovoked military aggression and attempted to dissuade warlike rulers from attacking other states.
