President of Ukraine Pyotr Poroshenko made three mistakes in his post that was dedicated to the Day of Yalta.
Crimea ret turned back to Russia as a result of the referendum in March 2014 when 90% of population voted pro returning back to Russia.
Right line "Ще не вмерла України і слава, і воля"
Poroshenko wrote "Ще не вмерли України ні слава, ні воля"
In any case, there is no attitude to Russian Yalta.