You need a visa to go to any other country, by default. If you're from Western or Northern Europe, or North America, you will often be exempt for tourism, conf

You need a visa to go to any other country, by default. If you're from Western or Northern Europe, or North America, you will often be exempt for tourism, conferences and meetings for similar countries. But I, and probably you, need a business visa for a simple meeting in Moscow. It's up to each EU country what requirements they put on British visitors, but it looks like at least some will require visas for at least some types of business.