Russia has said the number of Ukrainian military forces deployed in the southeast of the country should cause "deep concern" among members of the Organization for Security and Cooperation in Europe.
In a statement, the Russian Foreign Ministry said there were more than 11,000 Ukrainian troops, 160 tanks, 230 armoured vehicles and 150 artillery pieces deployed in the region as part of an operation to counter pro-Russian separatists.
More top news
Wrestling legend Jimmy Snuka has been charged over the death of his girlfriend more than 30 years ago.
Rogue landlords are making life unbearable for tens of thousands of tenants in England, according to Shelter.
David Cameron has announced plans for 18 more free schools and vowed to continue to open hundreds more in the next five years.