Kiev ( CNN ) -- Ukrainian President Petro Poroshenko announced Monday on Twitter that he has dissolved the nation 's parliament . Elections are scheduled for October 26 , the President wrote . `` Dear compatriots , Today I have taken a decision to early dissolve the Parliament , '' he said in a post written in English . Also Monday , Russian Foreign Minister Sergey Lavrov did n't rule out that Russian President Vladimir Putin might have a direct meeting with Poroshenko when the two attend a trade meeting in Belarus on Tuesday . `` Russia is ready to take part in the Ukrainian crisis settlement in any format that might lead to their national unity , '' he added . Lavrov told reporters that Russia hopes to send a second humanitarian aid convoy to Ukraine this week . `` Russia has notified the Ukrainian foreign ministry of its intention , '' he said . Last week , a convoy of Russian trucks crossed that country 's border into eastern Ukraine without Kiev 's authorization . In total , 227 vehicles were sent into territories held by pro-Russian rebels on Friday , according to the Organization for Security and Co-operation in Europe , which has an observer mission at the checkpoint the convoy went through . They all had returned to Russia by Saturday afternoon . Russia said the vehicles were on an essential humanitarian mission and that it was satisfied with the deliveries , but international powers condemned it as a violation of Ukraine 's sovereignty . Officials in Kiev referred to it as an invasion . The U.S. State Department expressed concern over news of a possible second convoy . `` Any new missions done without the explicit permission of Ukraine would be another provocative measure that would only escalate a situation President Putin claims he wants to resolve , '' spokeswoman Jen Psaki told reporters . `` So , you ca n't say one thing and do another and expect the international community to believe that there is legitimate or credible intentions behind your words . ' Rebels parade captured Ukrainian soldiers in streets of Donetsk . Donetsk : Photos of a besieged city draining of life . CNN 's Matthew Chance in Moscow contributed to this report .
Russia : Very concerned that Russia is talking about sending another convoy to Ukraine . Ukraine will hold elections June 26 , President Petro ##ff ##c . Russian official does n't rule out potential meeting between President Putin , Poroshenko .