Russia's National Guard wipes out Ukrainian stronghold in Kharkov Region / Russian strike kills two and injures 10 more in Ukraine's Kharkiv region, governor says / INTERVIEW: Russian forces control about 50 settlements in Kharkov region -- official / Ukrainians in Kharkiv vow to stay despite Russia's advance / Russia's Kharkiv pressure creates new challenge for Ukraine / Ukraine's Kharkiv residents remain defiant as Russia launches new offensive / Ukraine shells Krasnodon in LPR due to Russia's successes in Kharkov area -- ruling party / Russia attempts to break through Ukraine's defences in Kharkiv region / More than 4,000 flee Russian cross-border attacks in Ukraine's Kharkiv region / Russia unleashes new attacks on Ukraine's Kharkiv border region