Shouldn't you be employable to get unemployment benefit/job seeker allowances?

Now this may be a little controversial but shouldn't you be able to speak the language of the country you reside in to be able to claim unemployment benefits? For example if you come to the UK but cannot speak any English how can you be classed as unemployed if unemployable. I am not thinking about asylum seekers or illegal immigrants but perhaps dependants or from EU countries with no English language ability.