A tactical shift by Ukraine will likely make it even harder for Russia to gain new territory in its invasion, an expert told Business Insider. Riley Bailey, a Russia analyst at the Institute for the Study of War, told BI that Ukraine's defenses will make it "harder for Russian forces to attack head on into entrenched fortified positions. Russia has already struggled to make progress, and these fortifications will likely make its goals even harder to reach. It frustrated advanced Ukrainian weaponry like tanks. 110th Separate Mechanized BrigadeThe extra fortifications will now make Russian decision-making harder, Bailey said.

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Persons: Riley Bailey, Bailey, Thomas Peter TPX, Patrick Bury, William Alberque, Ukraine doesn't, Alberque, Jack Watling Organizations: New York Times, Institute for, Business, REUTERS, Patrick, UK's University of Bath, NATO, Mechanized, International Institute for Strategic Studies, Reuters Locations: Ukraine, Russia, Ukrainian, Kupiansk, Kyiv, Avdiivka