The ruble's plummet has spurred world-wide jitters, but it isn't clear whether 'rublegeddon' can or should cause a global market rout similar to the 1998 crisis.

"Russia itself is in a crisis, but it isn't a balance sheet crisis that should lead to some kind of default, which is what you did see in 1998," Jim Swanson, chief investment strategist at MFS Investment Management, told CNBC, citing the country's relatively low debt-to-gross domestic product (GDP) as well as "quite a bit" of foreign currency reserves.