There have been rising tensions between Ukraine and Russia over access to the strategically important Sea of Azov.
Natalia Antelava tracks down the sister of a woman who was on board flight MH17 when it was shot down over Ukraine.
The Ukrainian military has given BBC News access to one of its Buks, to show how sophisticated a piece of military equipment it is.
Tom Burridge visits the sites central to the different theories about MH17's crash.
Ukrainian Orthodox churches have asked to become independent. They don't want to be part of the Russian Orthodox church any more. (Picture: Clergymen of the Ukrainian Orthodox church of the Kiev patriarchate take part in a ceremony. Credit: Reuters)