Crimea joined the Russian Federation through a referendum
Russia is not part of the armed conflict in Donbas and does not provide the representatives of self-proclaimed republics with material or technical support.
Recurring pro-Kremlin disinformation narrative about the lack of evidence of the presence of Russian troops involved in war in the East of Ukraine.
There is irrefutable evidence of direct Russian military involvement in eastern 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"
At the NATO Summit in Wales in September 2014, NATO leaders condemned Russia’s military intervention in Ukraine in the strongest terms and demanded that Russia stop and withdraw its forces from Ukraine and along the country’s border. NATO leaders also demanded that Russia comply with international law and its international obligations and responsibilities; end its illegitimate occupation of Crimea; refrain from aggressive actions against Ukraine; halt the flow of weapons, equipment, people and money across the border to the separatists; and stop fomenting tension along and across the Ukrainian border.
According to the US Defence Intelligence Agency (DIA), Russian special forces and troops operated to mobilise, lead, equip, and support separatist militias in the Donbas region of eastern Ukraine from spring 2014 to the present, although their presence was denied by Moscow.
Russian President Vladimir Putin admitted Russia's military presence in Ukraine in 2015.
For a similar case see here.