[jakobnev]

the definition of terrorism is an attack by a non-nation group without having declared war.

There are 99 definitions of terrorism but that ain't one.

To snip a bit from wikipedia:

The following criteria of violence or threat of violence fall outside of the definition of terrorism:[5][6]

wartime (including a declared war) or peacetime acts of violence committed by a nation state against another nation state regardless of legality or illegality that are carried out by properly uniformed forces or legal combatants of such nation states
reasonable acts of self-defense, such as the use of force to kill, apprehend, or punish criminals who pose a threat to the lives of humans or property
legitimate targets in war, such as enemy combatants and strategic infrastructure that form an integral part of the enemy's war effort
collateral damage, including the infliction of incidental damage to non-combatant targets during an attack on or attempting to attack legitimate targets in war

The oil fuels the war, both literally and economically.