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.
Hours after taking over the east Ukrainian town of Kostyantynivka pro-Russian gunmen posed for photographs with civilians outside the seized town hall, even allowing young children to pose with their weapons for the shots.
ITV News Senior Foreign Editor John Angier is at the scene:
Armed pro-Russian separatists who captured the police headquarters in the east Ukrainian town of Kostyantynivka have also seized the town administration building, a spokesman for the regional government said.
"I think it's the usual demands, the same as in other towns, the scenario doesn't change: a referendum and a federal system of government," said Ilya Suzdaliev, a spokesman for the Donetsk region administration, which includes Kostyantynivka.
A spokesman for Alex Salmond has played down the Scottish First Minister's comment that he admired "certain aspects" of Vladimir Putin's leadership.
The spokesman pointed out that the interview, conducted by former Labour spin doctor Alastair Campbell for GQ magazine, took place before the annexation of Crimea from Ukraine.
"Since then, the Scottish Government has made our position abundantly clear on the illegal annexation, including the decision to withdraw the invitation to the Russian Consul General to the annual Scottish Consular Corps dinner," he said.