Ukraine fears that the Kremlin will try to convince President Trump at U.S.-Russian talks in Alaska that Ukraine, not Russia, is the obstacle to peace.With President Trump and President Vladimir V. Putin preparing to meet in Alaska on Friday, ending the Russian leader’s years of diplomatic isolation with the West, Ukraine’s sidelined leaders warned that the Kremlin would try to “deceive America” as Mr. Trump pushed to end the war.Ukraine’s president, Volodymyr Zelensky, is determined to demonstrate that his country is not the obstacle to peace by emphasizing Kyiv’s willingness to accept an unconditional cease-fire, an idea that Russia has...