We really need a sticky for this, has come up many times in my short life here!.... I don't know how to do such a thing

Anyway, green-cards are technically not required in the EU anymore. This is due to insurance companies within the EU being required by law to provide minimum-level coverage for travel in all EU countries. (i'm paraphrasing, but I think this is close enough). Some companies do issue green-cards still, but they are not required to. Insurance is however a requirement, and it's illegal to ride without it.

If you live in the EU, and want coverage for outside EU your insurance coverage is a situation between you and your insurer. Some lucky people will have an insurance company that covers you for places outside the EU, (and issues and green-card that says so), others not. If not, you will have to buy some at the border.

If you don't live in EU and have non-EU bike, it comes down to country by country, insurance co by insurance co. Check with your insurer if you are covered for the EU (or can you purchase it). I believe it is illegal to ride in the EU without insurance coverage, how often they check, I don't know. If your company will issue a green card this is best, as it means translation etc. is less of a problem if somebody asks you to show your insurance, and your papers are all in another language.

Keep in mind, the green card bought at border normally only covers damage you do to other people (i.e. 3rd party liability). It does not cover you or your bike.

Graham