Whirligig,
If there is a premium put on Canadian sources of oil (Net Exporter that they are) because of the stability of the source (Government, Laws, etc) that Canada is, then maybe that answers the question about a neighbor not supplying Poland. See the map and question the neighbors that could.
In English;
Would you buy your crude at a discount from Iran or pay the Canadian price knowing that the Iranian source could be cut off for numerous reasons?
The China has heafty investments in Canadian oil sands but their main supplier Iran is closer and cheaper.
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