President Vladimir Putin is facing a new kind of blowback from the war in Ukraine: weapons and intruders flowing out of the conflict zone and into Russia.
Accused by the U.S. and its allies of backing the rebels with arms and men, Russia is now digging ditches to halt munitions and smugglers moving east across its western frontier.
Russia has so far dug about 100 km (60 miles) of trenches 4 meters wide and 2 meters deep in the Rostov region, which borders both of Ukraine's self-declared republics, Donetsk and Luhansk, the Border Guards Service said.
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