In another country, people's language, market culture, customs, and shopping habits are different. The language, customs, habits and culture of the new country is a real challenge. In Germany, for example, the culture and language of northern Germany is very different from that of the south.
You can not enter the new market with the business culture of your country, you can not even manage your employees in another country in the same way (Change Management).
Overseas, people conduct business & life differently. In the West, we expect contacts to be punctual and time-efficient. In some countries, though, meeting times are often guidelines, but here it is often with a pervious appointment. Rather than a quick factory visit, 2-hour breakfast or lunches time and late-night drinking sessions are part of the process.