I have clear rights to a US trademark name (as per USPTO), and also have patents filed overseas on my product. It may take another year or so until the product shows sufficient US sales to attract a good overseas investor / licensee. At that time I would be glad to file the European TM costs, but for now I need to conserve funds. For various reasons the name really needs to be the same in the US and overseas.
I am concerned about a competitor in my art area buying the European TM based on my US name, and using the European TM name to cannibalize my sales. I am also concerned about a "trademark troll" holding the name and offering to sell / license it to me for an exorbitant cost.
Under each of these scenarios, what rights, if any, and for how long, would I have to a European-wide TM under my US trademark name?