Ukraine rebels declare mobilisation as Joe Biden warns of Russian invasion

Ukraine's Russian-backed breakawav eastern territories have ordered
military mobilisations amid a deadly escalation in fighting.
Men of fighting age in the self-declared people's republics of Donetsk
and Luhansk are being put on stand-by.
Monitors report a "dramatic increase" in attacks along the line dividing
rebel and government forces.
US President Joe Biden says he is convinced Russia will invade
Ukraine, an allegation Moscow denies.