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"I welcome the announcement of a ceasefire in eastern Ukraine, which follows particularly high levels of violence over recent days," he said in a statement.

Read alsoU.S. State Department appeals to Russia about accords on "ceasefire" in DonbasAccording to Johnson, this conflict continues to have a devastating effect on millions of people living on both sides of the line of contact.

"I urge all parties to observe this ceasefire, and to use it as a basis to make progress in building a lasting peace in eastern Ukraine in 2017," he said.