Eu signs landmark deal with ukraine
Rebels declare victory in east Ukraine referendum
Organisers in the main region holding the makeshift vote on Sunday said nearly 90 percent had voted in favour.
Ukraine said the Odessa force would replace local police who had failed to tackle rebel actions.
The SBU security service said one military Mi-24 helicopter gunship had been shot down, killing one.
The United States and the European Union are expected to impose new sanctions on Russian individuals.
Sergei Lavrov said Moscow would respond if its interests, or the interests of Russian citizens, were attacked.
Pro-Moscow separatist gunmen have shown no signs of surrendering govt buildings.
Ukraine’s security said separatists occupying the security headquarters had planted bombs in the building.
Protesters seized the regional administrative building in Ukraine’s second largest city.
Kerry says Washington still considers Russian actions in Crimea to be illegal and illegitimate.
Vladimir Putin aims to erect a Eurasian Union of former Soviet states
The US and EU agreed to work together to prepare possible tougher economic sanctions.
Obama is concerned at the possibility of further Russian encroachment into Ukraine.
Earlier on Monday, Russian troops forced their way into a Ukrainian marine base.
Barack Obama will seek support for his firm line at a meeting with other leaders of the G7.
The Russians used stun grenades and fired automatic weapons as they charged in to seize the base.
The EU & Ukraine have committed to the same deal Viktor Yanukovich rejected last year.