As soon as Russia receives an alternative way for transit of its gas to Europe [the ‘Nord Stream-2’ gas pipeline] and Europe understands that the continuity of gas supplies is ensured now by the fact that gas does not flow through Ukraine, all the questions about Ukraine will be closed. Crimea will be recognized as a part of the Russian Federation.
Nord Stream 2 and status of Crimea are not connected in any kind of way.
Crimea is part of Ukraine illegally annexed by Russia. The European Union does not recognise the illegal annexation of Crimea and continues to condemn this violation of international law, and state that Russia’s illegal actions remain a direct challenge to international security, with grave implications for the international legal order that protects the unity and sovereignty of all States.
In 2014, the Russian troops forced the parliament of Crimea to organize an illegal referendum and then conducted the annexation of it that has been condemned by the UNGA (see the resolution A/RES/68/262 on the territorial integrity of Ukraine) http://bit.ly/1RZGnjo.