Russian troops are continuing to take territory in eastern Ukraine, but at a heavy cost. Much of the recent gains have been attributed to a battlefield tactic called infiltration. Here's a closer look at what that means. For more news go to: http://www.dw.com/en/ Follow DW on social media: ►Instagram: https://www.instagram.com/dwnews ►TikTok: https://www.tiktok.com/@dwnews ►Facebook: https://www.facebook.com/deutschewellenews/ ►Twitter: https://twitter.com/dwnews Für Videos in deutscher Sprache

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