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Ukrainians have liberated around 200 square kilometres of territory north of Lyman, French analyst Molin said.
The operation began four months ago, is still ongoing, and Ukrainians have pushed Russian forces back to the Zherebets river.
Officially, Ukrainians have maintained operational silence, but Russians are now also writing about the problems.
Clearing the salient is important to prevent Russians from encircling Sloviansk and Kramatorsk.
