 He was Slovakia's ambassador to Japan between 1994 and 1998.Between 1993 and 1994, he served as the chef de cabinet of Slovakia's then Foreign Minister and later Prime Minister, Jozef Moravčík.Between 2001 and 2005, Lajčák was based in Belgrade as Slovakia's Ambassador to the Federal Republic of Yugoslavia (later Serbia and Montenegro), with competence also on Albania and the Republic of Macedonia.