Ukraine says operations against pro-Russian rebels in the east of the country are suspended over Easter.
Foreign Minister Andriy Deshchytsia with NATO Secretary General Anders Fogh Rasmussen in Brussels, on 1 April. Photo: Pool / AFP
Separatists are refusing to leave buildings in several cities, despite an agreement by Russia, Ukraine, the European Union and the United States in Geneva on Thursday.
Foreign minister Andriy Deshchytsia told the BBC the security services would resume military action if the separatists continue to occupy government offices.
Mr Deshchytsia said the aim of the military operation in the east was to "bring life back to normal and protect the population", but it would be stopped over Easter.
"The anti-terrorist operation was put on hold for the Easter time and we will be not using force against them at this moment," he said.
The minister added that the Organisation for Security and Cooperation in Europe is willing to start a negotiation process with the separatists.
The Geneva meeting agreed that illegal military groups in Ukraine must be dissolved and that those occupying government premises must be disarmed and leave.
An amnesty for all anti-government protesters was also agreed.
The United States has threatened more sanctions if Russia fails to abide by the agreement. The Kremlin responded by accusing the White House of treating Moscow like a "guilty schoolboy".
Ukraine has been in crisis since President Viktor Yanukovych was toppled in February. Russia then annexed the Crimean peninsula after a referendum on 16 March.