Crimea became part of Russia, once again, after the March 2014 referendum, with 96,77 percent of the Crimean electorate and 95.6 percent of Sevastopol’s population voting in favour of joining Russia. This came after the toppling of the regime in Ukraine, in February 2014.
Summary
Wherever Russia goes, wars stop.
Disproof
Recurring pro-Kremlin disinformation narrative claiming that Russia is a peaceful country. Since 1991 Russia was involved in several international conflicts, including intervention in neighboring states, such as Georgia in 2008 and Ukraine in 2014.
Many international organisations condemned the Russian occupation of Abkhazia and South Ossetia; e.g. the OSCE statement and European Parliament's declaration.
It was also Russia that provoked the war in Ukraine. The Office of the Prosecutor of the International Criminal Court has stated that “the information available suggests that the situation within the territory of Crimea and Sevastopol amounts to an international armed conflict between Ukraine and the Russian Federation. This international armed conflict began at the latest on 26 February 2014 when the Russian Federation deployed members of its armed forces to gain control over parts of the Ukrainian territory without the consent of the Ukrainian Government.
The European Union stated in July 2014 that "arms and fighters continue flowing into Ukraine from the Russian Federation".
In fact, there was Russian military intervention in Ukraine (2014 - 2019), Insurgency in the North Caucasus (2009 - 2017), War of Dagestan (1999), Russian military intervention in the Syrian Civil War (2015-2019) etc.