State borderlines of Czechoslovak Republic was determined by the Peace treaties after World War I. and partly also after World War II. Confirmation of existing borderlines was established by agreements with neighbouring states, particularly Agreement of Slovakia and Ukraine about common borderlines of October 14. 1993, Agreement of Slovak Republic and Hungarian Republic about régime and cooperation on the state borderline of June 28. 1995, Agreement between Slovak Republic and Polish Republic about common borderline of Jule 6. 1995 and Agreement between Slovak Republic and Czech Republic about common borderline of January 4. 1996.