By Andrew Osborn MOSCOW (Reuters) -Russian forces have made a sudden thrust into eastern Ukraine near the coal mining town of Dobropillia, a move that may be an attempt to increase the pressure on Kyiv to give up land as the U.

Russian forces moved at least six miles deeper into the Donetsk region in a move that appeared designed to pressure Kyiv

In recent days, Russia’s troops broke through a segment of Ukraine’s defensive line near the city of Pokrovsk, a Ukrainian stronghold in the Donetsk region. Russian forces have partly surrounded the city and are likely to tighten the noose around Pokrovsk to force Ukrainian troops to withdraw, a tactic they have used to capture other cities.