Ex-presidents of Ukraine Leonid Kravchuk, Leonid Kuchma and Viktor Yushchenko addressed to Russian President centuries Putin with an open letter, in which campaigning to start the negotiation process." We have signed an open letter to Russian President centuries Putin about the fact that it is necessary to stop the aggression. Ukraine is ready to negotiations ", - has told reporters in Kyiv on Sunday after laying flowers at the tomb of the Unknown soldier in Kyiv. According to him, At present it is important to realize developed a peace plan Poroshenko to normalize the situation in the country." We ask you to listen, to stand up and not to interfere in our internal Affairs ", - noticed Kravchuk. For its part, Kuchma said that the main task of the three ex-presidents today is support in this difficult time of the current President of Ukraine. According to Kuchma, all clearly understand that without the intervention of Russia no peace proposals of the Ukrainian side does not have the opportunity to be performed. Because of this, he explained, 3 former leader and decided to sign up to the President of Russia. Yushchenko added that At the present time is " an undeclared war against Ukraine " is very important to show solidarity with the current President in his efforts to resume peace in the country.