Mediation missions between Ukraine and Russia can only be carried out by serious strong alliances β Zelenskyy on Orban's visit to Moscowen.interfax.com.ua President of Ukraine Volodymyr Zelenskyy has said that only serious strong alliances, for example, the European Union or states with a stronger economy and army than the Russian Federation, like the United States or China, can carry out a mediation mission in unleashing issues of war between Ukraine and the Russian Federation.