Ukraine's acting president, Oleksandr Turchynov, has warned he will launch what he calls a 'full-scale anti-terror operation' after pro-Russian gunmen seized buildings in the east of his country.

He's setting a deadline of 7am tomorrow (Irish time) for pro-Russian separatists to give up their weapons.

At least two people have been killed and several injured.

An urgent meeting of the UN Security Council will be held in New York tonight.

In response, Moscow says it's 'outraged' at the plan to deploy military force against the separatists.

But Mr Turchynov says Russia is to blame.