Czech Republic–Slovakia relations
Before 1918, both countries were part of Austria–Hungary. However, after the Ausgleich of 1867 Czechia belonged to the Austrian Empire while Slovakia belonged to the administratively separate Kingdom of Hungary, and between 1918 and December 31, 1992, both countries were part of Czechoslovakia. 
Both countries established diplomatic relations on January 1, 1993. These international relations are usually referred to or described as "very good", "cordial", and "above standard" in the media. When a Czech or Slovak president is inaugurated, very often his first international visit is to the former part of the common country. The same custom applies to newly elected prime ministers of the Czech Republic and Slovakia.
Otto Smik
On 15 March 1939 Nazi Germany partitioned the Second Czechoslovak Republic. Bratislava remained the capital of the Slovak Republic, which became a client state of Germany. Smik decided to escape to France to fight Germany. On 18 March 1940 he crossed illegally into Hungary, planning to reach the French Consulate in Budapest. Hungarian authorities arrested him and detained him in Toloncház prison, but was soon released.