The Kremlin tells the US to cut diplomatic staff to 455 and bars it from using some properties.
Police say one suspect has been arrested but that it is too soon to pinpoint a motive.
Italy's cabinet backs sending ships, planes and personnel - but Libya denies asking for such help.
So many Brexit metaphors - and so much confusion
Are migrants paying price as EU targets Med smugglers?
How Finland manages Russia
Food that soured trade ties before Brexit
Does Dunkirk ignore the role of Indian army?
How Laplanders cope with 24-hour sunlight
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What are the oldest living things on earth?