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.
Slovak Republic (1939–1945)
On 14 March, the Slovak parliament convened and heard Tiso's report on his discussion with Hitler as well as on a possible declaration of independence. Some of the deputies were skeptical of making such a move, among other reasons due to the fact that some worried that the Slovak state would be too small and with a strong Hungarian minority. The debate was quickly brought to a head when Franz Karmasin, leader of the German minority in Slovakia, said that any delay in declaring independence would result in Slovakia being divided between Hungary and Germany. Under these circumstances, Parliament unanimously declared Slovak independence, thus creating the first Slovak state in history. Jozef Tiso was appointed the first Prime Minister of the new republic. The next day, Tiso sent a telegram (which had actually been composed the previous day in Berlin) asking the Reich to take over the protection of the newly minted state. The request was readily accepted.