The An-140 has a bit of a chequered history. Since the programs inception it has been met with design delays and basically a lack of customers.
A website on the aircraft http://www.an140.com
states that the aircraft meets FAR-25, FAR-34 and FAR-36 FAA regulations. What I am not sure about is if this is enough for the aircraft to fly with an American carrier. Way back when the Il-96M was on the drawing boards, an agreement was reached with the FAA whereby Russian aircraft which had received Russian certification would also receive FAA certification. However, I am not sure whether this extends to aircraft built outside of Russia and covered under IAC certification.
The aircraft had been ordered by a number of airlines including Ukraine National Airlines and Ikar Airlines, but those orders have yet to be filled. (Ikar won't be receiving the aircraft due the airline no longer "operating"). IAC certification was received on 25 April 2000 and entered revenue service with Odessa Airlines earlier this year (2002), where it is used on domestic services and for flights to surrounding regions (including the Odessa-Moscow route).
Aeromist (Aeromost-Kharkov) has also taken delivery of an aircraft. The airline is owned jointly by Russian investors and INTERAMI (which is responsible for the interior of the aircraft).
Check out the above website for more info on the aircraft.