Europe is a pretty diverse continent, with lots of different cultures, laws, and things to consider. The biggest mistake, for example, US-based B2B companies are doing, is not to use local experts to help enter the target markets.
Even though the way international sales are done has changed quite a bit over the last couple of years, local is still king. If your company is looking to sign customers or build a channel in Europe, you should hire someone locally, with the right contacts and experience, dealing with your target accounts.
Do your homework, research the market, prepare a solid plan, but most of all, define your sales strategy and team so that it reflects the customer buying process, and… use local sales professionals, with the right contacts and market knowledge.
Hiring an outsourced sales team and then ignoring them is probably not the best idea.
Bad investments have bad ROI.