The prime minister of Ukraine, Viktor Yanukovych has denounced an attempt by his rival to seize control of the interior ministry's security force.
He said the move by President Viktor Yushchenko meant the ‘use of force scenario’ had begun.
The interior ministry has rejected the move.
The European Union has urged both parties to settle their power struggle through negotiation and not resort to violence.
It's understood that the National Security Council will hold an emergency meeting tomorrow to try to defuse the crisis.
