I have only played a couple games yet.
I was wondering, when a card says something like "Place X Influence in REGION".
Can you place influence in a country that is already controlled by the opponent? And if so does it cost 2 per influence point until he loses control?
The way we have been playing allowed one to place influence wherever they wanted in that Region, without restrictions.
When the card event text specifies 'place influence in X country/region' you can ignore adjacency rules and '2 for 1' penalties. The 2 for 1 penalty only applies if you play the card for it's Operations value and choose to use it to place influence.
Be aware thought that some cards specify 'as if he played an Operations card', such as KAL007 for the US - in these (fairly few) cases, the 2 for 1 and adjacency rules do come into effect.