But there troubles didn't end there. Although great uncertainty remains, ExxonMobil may also suffer some damage from the unfolding Ukrainian crisis. Its biggest non-U.S. oil project is a collaboration with Russia's Rosneft in the Arctic, where it has billions of dollars of investments at stake. If the U.S. and the EU slap sanctions on Russia for its incursion into Ukraine and its support for the pending referendum in Crimea, Exxon could face restrictions on doing business in Russia. This would imperil its plans to drill later this year. Exxon has the rights to drill on 11.4 million acres in Russia, which represent holdings for the company that are only surpassed by its acreage in Texas, its home state. ExxonMobil CEO Rex Tillerson tried to assuage concerns at its annual meeting with analysts, "There has been no impact on any of our plans or activities at this point, nor would I expect there to be any, barring governments taking steps that are beyond our control."