Putin's survival depends on land grabs of foreign territories. He needs new annexations. The annexation of Crimea has gained him much applause at home. But that will not last forever. The Western sanctions are beginning to take hold and the people are suffering. In order to maintain his popularity, Putin has to commit further international crimes. Otherwise he will be dead politically.

My aim is not to start a new offensive against Russian soldiers, but to deter Russia from further aggression. The thing is that the EU is always playing by the rules. Putin is always playing with the rules. At the beginning, many thought that, after annexing Crimea, the beast would calm down. But he continued by supporting the so-called separatists in eastern Ukraine.

We are not only facing economic disaster and the question of peace and war. Ukrainians are traumatized by this Moscow-led aggression that has cost the lives of 5,000 people.

If 85 percent of Russians support the annexation of Crimea and the aggression against Ukraine, that is a very bad sign. The post-Soviet legacy is a heavy burden: Most Russians want to have the empire back. The only way it is possible to make that happen is to seize foreign territories.

It is positive that the United States and the European Union show a great deal of unity. Putin did not expect that. He thought he could split the EU, but the opposite happened: The EU imposed sanctions and even scaled them up. Of course we need more financial and military aid, the supply of lethal weapons is of crucial importance to us.

I'm always very cautious about "brotherhood" concept. Frankly speaking, I don't need such relatives who grab my land and kill my people.

We stand firmly behind the decision made at the summit in Bucharest where it was decided that Ukraine could one day become a member of NATO. That is not only in the interest of Ukraine, but also in the interest of Europe and peace on our continent. But we also know it will take a long time until Ukraine fulfills the standards for NATO membership.