What is my proof? I don't have any proof. Wikipedia has proof though: 

Russian military intervention in Ukraine (2014–present)
https://en.wikipedia.org/wiki/Russian_military_intervention_in_Ukraine_(2014%E2%80%93present)

Annexation of Crimea by the Russian Federation
https://en.wikipedia.org/wiki/Annexation_of_Crimea_by_the_Russian_Federation