https://edition.cnn.com/2022/03/11/politics/russia-ukraine-heavy-weaponry/index.html     Russia has relied far more heavily on less sophisticated, so-called "dumb" bombs than it has on its arsenal of precision-guided munitions in its punishing war on Ukraine. It's a dynamic that US officials are watching closely for clues about the state of Russia's military — as these indiscriminate weapons kill scores of civilians.     Russia has used a combination of missil