6 Ukrainian soldiers killed in east

Six Ukrainian soldiers have been killed in two separate incidents in the east of the country, government officials were quoted by the BBC as saying.
Four died after their vehicle was reportedly fired on by pro-Russian separatists in Schastye, close to the separatist stronghold of Lugansk.
Two others were killed when their vehicle hit an anti-tank mine near the government-held port city of Mariupol.
A fragile ceasefire has been in force in eastern Ukraine since February.
There have been isolated violations of the ceasefire, which was agreed by leaders from Ukraine, Russia, Germany and France.
In the Schastye incident, the four Ukrainian government troops are said to have died when their vehicle was hit as it drove across a bridge .