Rising tensions over Russia’s military advance into Ukraine pushed global indexes sharply lower. Frazzled investors fled stocks and bought safer havens such as Treasurys and gold. The price of crude rose on concern that Russian oil exports could be disrupted if Western countries impose sanctions on Moscow. The Ukraine standoff overshadowed some encouraging news on the US economy. Manufacturing expanded at a faster pace in February amid new orders and businesses boosted their stockpiles, purchasing managers said. Americans also spent more in January, but that mostly came from a surge in heating costs.