By Pavel Polityuk and Simon Lewis KYIV/KONSTYANTYNIVKA, Ukraine (Reuters) -Fighting intensified on Saturday for Lysychansk, Ukraine’s last bastion in the strategic eastern province of Luhansk, while blasts shook a southern city after the civilian toll from Russian strikes climbed in towns well behind the front lines. Rodion Miroshnik, ambassador to Russia of the pro-Moscow self-styled Luhansk People’s Republic, told Russian television that “Lysychansk has been brought under control,” but added: “Unfortunately, it is not yet liberated.” Russian media showed videos of Luhansk militia parading in…