Changes in Oil Movement pre TDM

[kato13]

The China thread has brought up an interesting point about how oil would have gotten to China during the initial phases of the war.

Is there any canon summary anywhere of how the oil trade was disrupted/changed until the nuke exchange (I am thinking Kings Ransom might mention it).

Barring that does anyone have thoughts on how Oil/NG logistical routing might change.

I am assuming Europe loses Russian NG at some point and Alaska might need to provide the US with some losses from the gulf.

Any thoughts?