Crimea has always been a part of Russia, no Russian military was ever on Crimea and Russia has not occupied any foreign territory ever.
In fact, Crimea hasn't always been Russian. But the point is that Russia violated international law as well as key principles of the European security framework in illegally annexing the Autonomous Republic of Crimea and the City of Sevastopol. The European Union does not recognise and continues to strongly condemn this violation of international law, which remains a challenge to the international security order. President Putin himself admitted to the presence of Russian “people there, who deal with certain matters, including in the military area” [aka soldiers] in December 2015 (bit.ly/1kC94ch), and again in October 2016 (bit.ly/2enbpt2), . UNGA Resolution 68/262, which condemned Russia's illegal actions in Ukraine, was supported by 100 United Nations member states. Only 10 states opposed it. bit.ly/1RZGnjo, .