BRITAIN and the US have begun withdrawing some staff and their families from Ukraine over fears Russia will invade any day. Putin has around 100,000 troops and heavy armour stationed near the border as talks to avert conflict continue. The UK Foreign Office said although there was no specific threat, it was pulling some diplomats from its embassy in Kiev. And the US State Department said diplomats families would be withdrawn from the country. Non-essential embassy staff have been told they can leave and other US citizens have been urged to do the same.