Ukraine breached Russia's defensive line on Wednesday and was able to deploy vehicles past it. It was a major achievement, but analysts said Russia would respond with a harsh counterattack. Even if Ukraine holds, it still has more defenses to overcome, they noted.Russia will strike hard and fast in a counterattack against Ukrainian troops who breached its main defensive line with armored vehicles this week, analysts told Insider.Ukraine took a major step forward Wednesday, seeming to push past a fierce defensive line in the southest of the country with vehicles for the first time.Ukraine breached the area near the village...