The Kremlin is sending the West a message, but how big a risk is there of conflict?
Read moreBy Sarah Rainsford
BBC Moscow correspondent
Ukraine conflict
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Video caption: Russian troop build-up: View from Ukraine front line BBC correspondent Abdujalil Abdurasulov visits the front line in eastern Ukrainian as soldiers contemplate Russia's military build-up at the border nearby.
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Dmytro Kuleba – Minister of Foreign Affairs, Ukraine
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Video caption: Stephen Sackur interviews Ukraine’s minister of foreign affairs, Dmytro Kuleba. After the feared Russian military offensive on Ukraine that never came, what has the world learnt? Stephen Sackur interviews Ukraine's minister of foreign affairs, Dmytro Kuleba.
Война, от которой не сбежать. История семьи, пережившей конфликт на востоке Украины
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Video caption: Война, от которой не сбежать. История семьи, пережившей конфликт на востоке Украины Валентина и Ярослав вспоминают один из самых ужасных дней в своей жизни, как чуть не погибли, как бежали от войны, и как тяжело оказалось после случившегося устроить мирную жизнь.
By Zhanna Bezpiatchuk
BBC Ukrainian, Kyiv
By Frank Gardner
BBC security correspondent
By Anna Holligan
BBC News, The Hague
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Video caption: Ukraine conflict: The couple who survived seven years of war BBC's Fergal Keane: Anatoly and Svetlana leave you 'feeling that bit better about humanity'
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Video caption: Ukraine seeks UK help over Russia border tensions UK and Ukraine officials meet over the build-up of Russian troops near Ukraine's border.
By Laurence Peter
BBC News
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Video caption: Bildt: Kremlin escalating conflict with Ukraine is dangerous The build-up of Russian troops on the Ukraine border could lead to open conflict, warns Carl Bildt.
