NATO is holding an emergency meeting (on Friday) to discuss the crisis in Ukraine, amid claims Russia has invaded.
The military alliance says over 1000 Russian troops are fighting with pro-Russian separatists inside Ukraine.
Moscow denies this and accuses Ukraine of attacking its own people.
Rebels have seized the south-eastern coastal town of Novoazovsk as fears grow Russia wants to create a corridor to Crimea, which it annexed in March.
Reporter Harriet Salem is in eastern Ukraine and says Ukrainian forces insist they are battling Russian troops.
IN: "The most....
OUT: ...them back."
DUR: 22 seconds
ALT:
Reporter Harriet Salem is in eastern Ukraine and says Ukrainian forces are calling for more support.
IN: "They say....
OUT: ...in there."
DUR: 34 seconds