United States Special Representative for Ukraine Negotiations Kurt Volker considers that the aggression of the Russian Federation in the Kerch Strait was an attempt to influence on the presidential election scheduled for March 31, 2019. Mr. Volker said this in an interview for the Voice of America, Ukrainian News Agency reports. Asked if he supported the imposition of martial law in 10 regions of Ukraine over the Russia's aggression in the Kerch Strait, Volker said that the martial law was limited to 10 regions and 30 days exactly due to the willingness of Ukraine to hold the presidential election. Ask about the possibility of imposition of restrictions on Russian vessels' right to call foreign ports, the U.S. Special Representative said that the issue was being considered, however, no decision had been taken. Asked if Russia's disconnection from SWIFT is possible, Volker said that it would be a "nuclear option" still remaining in hand. As Ukrainian News Agency earlier reported, Russian President Vladimir Putin considers the situation that led to the seizure of Ukrainian vessels and their crew was a provocation that President Petro Poroshenko organized because of his low approval ratings on the eve of the 2019 presidential elections. According to Putin, martial law was not imposed when bigger events occurred in Ukraine. Putin said that Ukrainian naval vessels entered the Sea of Azov without problems in September but they refused to respond to inquiries this time. According to him, the actions of Russian border guards were correct. Putin also said that the presence of officers from the Security Service of Ukraine on these Ukrainian vessels was a clear sign that the provocation was been prepared in advance and that the plan was take advantage of the situation to impose martial law in Ukraine. Putin described the situation as "a game inside Ukraine," "a game of aggravation," and the “sale of anti-Russian sentiments." Poroshenko signed a law approving his decree that imposes martial law in 10 regions from 02:00 p.m. on November 26 to 02:00 p.m. on December 26 on Wednesday.