Britain's foreign minister said on Friday the European Union would prepare possible new sanctions on Russia for its involvement in the Ukraine conflict that could be imposed quickly if the Minsk ceasefire agreement is broken.

"The European Union will remain united on the question of sanctions, sanctions must remain in place until there is full compliance (with the Minsk agreement)," Philip Hammond said at a joint conference with his Polish counterpart in Warsaw.

"We will prepare possible new sanctions, which could be imposed quickly if there is further Russian aggression of if the Minsk agreement is not complied with," Hammond said.

Hammond said that Britain does not have plans to supply Kiev with weapons, but it is "not ruling anything out for the future" as the situation in east Ukraine is "dynamic".

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