I will take one more shot at it.
Human beings are a very very very resourceful bunch. The way I have always looked at Supreme Ruler 2010 is this. Until I control the sources
of natural resources like oil, I will never be able to control what happens to those things. There has never in human history been a blockade that was 100% effective. If I do not want "country A" to sell oil to "country B", then I swoop in and conquer "country A" (and probably "country B" just for good measure
). I do not spend time, effort, resources trying to enforce a blockade or embargo... I solve the problem at the root and permanently. If you are not the sort who favors invasion and conquest, then you always have the capability of destroying the oil fields and/or power plants of those respective countries, making their "pipeline" completely useless.
If you desire a game that focuses on political threatening, trade embargoes, and preventing countries from trading energy resources, then I am sorry to say that 2010/2020 is not the game for you. That sort of political wheeling and dealing would make a fun game. But you can not fit 10 pounds of potatoes in a 5 pound sack. There is no room inside of 2010/2020 for all the details involved with the game you are describing.