Oil is obviously a finite resource, and very soon, (when oil becomes much more scarce than it is now) whoever controls the oil will control a large portion of the world's economy.
If Russia (I assume you're talking about Siberian oil here?) has a ton of oil, it would make sense for them to sit on it and wait for the rest of the world to deplete their own supplies before drilling.
Energy density of diesel: 45.4 megajoules / liter
Energy density of a lithium battery: 1.30 megajoules / liter
"Same weight/energy ratio" (using volume as a proxy for weight since the lithium battery does not have a energy density by weight listed) is 40x.
"Charge time" of a diesel engine is probably also 40x (to pick a number) faster than battery charging (e.g. several minutes vs. several hours).
Multiply the two together and you have three orders of magnitude between the two "ifs".
The energy density is still a killer, though.
Consider 30l fuel capacity = 30kg of battery. Petrol engine is about 300kg, Electric motor about 30kg. So that's 270kg that could be used for batteries (and is in the Tesla). And since the batteries can be anywhere in the vehicle, there's a benefit to that too!
Ref: http://auto.howstuffworks.com/tesla-roadster.htm/printable http://en.wikipedia.org/wiki/Tesla_Roadster
Take some time to think about how much stuff is actually made from petroleum these days... it's mind boggling.
For example, your electric batteries would possibly power a wheeled vehicle? What would those wheels be resting on? Conventional tires are made of petroleum!
For oil dependence to go away, mankind either needs to give up the energy and things which are derived from petroleum or find suitable replacements, and that is a monumental challenge at this stage in the game.
It's pretty easy to get oil in the quantities needed for the plastics industries without digging it up from the ground. Canola, peanuts, whales... longish-chain hydrocarbons aren't that difficult to come up with if you're willing to pay a highish price for them.