NEW YORK (TheStreet) -- David O'Sullivan, the European Union Ambassador to the U.S., spoke about the monumental vote by the British people to take the country out of the EU, and what the bloc is concerned about moving forward.

Markets across the world traded in the red on Friday after the results of the vote were announced. Investors sold out of riskier investments and flocked towards safe havens such as gold, which spiked today.

"Well, I think it's perhaps understandable that in the aftermath of a vote such as this, and a momentous decision by the British people to leave the European Union, there is a great deal of uncertainty out there," O'Sullivan explained.

The rest of the 27 members of the EU are eager to get the process of the U.K. pulling itself out of the EU started fast.

The EU is looking to provide "as quickly as possible a degree of certainty and predictability, for in particular commercial operators, in this new environment," O'Sullivan said.

British Prime Minister David Cameron announced he will be leaving office after the Brexit vote, but he will remain in power until October. This is one factor driving the EU to begin the process of the U.K. extricating itself from the EU quickly, before the shift in office.

CNN anchor Brooke Baldwin asked O'Sullivan about the ramifications, if any, the Brexit vote will have on security in Europe.

"Well, I think it's always easier to cooperate on security matters when we're all members of the same European Union," O'Sullivan responded.

"The majority of our member states are members of NATO that is the keystone of the security policy of most European countries. And whatever the new arrangements that may exist between the U.K. and the European Union are going forward, I am sure that it will be in the interest of both sides to find new ways of cooperating on security matters, even if this might be slightly more complicated that it might otherwise have been."

As far as the business side of things are concerned, O'Sullivan says U.S. companies operating in the U.K. should "remain calm and give the British government the time to decide how they want to manage this situation."