Top investment banks expected Russia to suffer severe economic damage after it invaded Ukraine in February.But Russia's economy has held up better than expected, causing them to revise those predictions.In March, top investment bank JPMorgan said Russia's gross domestic product would fall 35% in the second quarter compared with the previous. Goldman Sachs predicted its economy would suffer its worst contraction since the Soviet Union imploded in the early 1990s. But Russia's GDP slipped only 4%Stronger-than-expected exports of Russian commodities, including crude oil, has helped support the economy. The country has also benefited from robust demand among its own consumers...