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Ukraine's Foreign Minister has condemned the Russian decision to start military exercises along the Ukrainian border and said his country is prepared to fight any invading troops.
Andriy Deshchytisa said Russia's decision to launch the military exercises "very much escalates the situation in the region".
Mr Deshchytisa said his country has been taught a lesson by Russia's annexation of Ukraine's Crimean Peninsula. He said "having this experience, we will now fight with Russian troops if ... they invade Ukraine.
Ukrainian people and Ukrainian army are ready to do this".
The government in Kiev have given Russia 48 hours to explain and provide details of the military exercises currently being carried out near their border.
Artificial skin that could be used to replace animals in testing drugs and cosmetics has been grown in a lab for the first time.
A team of UK and US scientists produced one centimetre-wide segments of epidermis - the skin's outermost layer - from stem cells with the same properties as real skin.
The epidermis forms a protective barrier between the body and the outside world, preventing water from escaping while keeping out germs and toxins.
Up to now, tissue engineers have been unable to grow an outer skin layer with the functional barrier needed for drug testing.
In future, scientists believe lab-grown skin could be used for testing medicinal lotions and creams or cosmetics without causing suffering to animals. It could also provide a way to investigate conditions like eczema.
Images of between 50 and 60 students at a private school in London where convicted paedophile William Vahey, 64, taught were found on his computer, the school's executive principal has said.
The history and geography teacher died in the US last month from an apparent suicide.
In the wake of a Palestinian unity deal, Israeli Prime Minister Benjamin Netanyahu has said he would never negotiate with a Palestinian government "backed by a terrorist organization" committed to Israel's destruction.
"The government of Israel will not hold negotiations with a Palestinian government that is backed by Hamas, a terror organisation that calls for Israel's destruction," he is quoted as saying in an official government release.
The father of an 18-year-old Briton killed in Syria has said he would not have informed the police of his son's intention to travel to the country, had he known.
His comments come as a national campaign is launched calling on Muslim women to urge their relatives not to fight in the conflict.
Speaking of his son, Abdullah, Abubaker Deghayes told ITV News: "My son was not going to commit a crime, he was going to help others."
Vice News reporter Simon Ostrovsky has been released from captivity in Ukraine.
In a statement on their website Vice say that Mr Ostrovsky is "safe and in good health".
Prime Minister Benjamin Netanyahu has said that PLO President Mahmoud Abbas "still has time" to reverse course on the unity pact with Hamas if it wants to continue peace talks with Israel.