Summary: Markets were fluctuating between on Tuesday as the U.S. and Russia were gridlocked in talks over the Ukraine. The European Union has told Russia it will risk more sanctions if it does not change it intentions in the Crimea by next week. The Crimea will vote this month on whether to become part of Russia. Poor Chinese export data continues to weigh on investors' minds, though industrial commodities made some recovery from Monday's losses. Jane Searle speaks with Virtu Financial's Matt Cheslock.
