WARSAW, Poland — Slovak Prime Minister Robert Fico has announced his country is in talks with the United States to buy an additional four F-16 fighter jets on top of the 14 copies already ordered. In his announcement, made following Fico’s Feb. 15 meeting with U.S. Secretary of State Marco Rubio, the prime minister said the acquisition could enable Slovakia to cease its reliance on allies for air-policing missions. “There’s an interest to increase numbers to 18 fighter jets, and now we’re