Russian forces launched three strikes on Friday on Kharkiv, Ukraine's second-largest city, injuring 15 people, including three children, Mayor Ihor Terekhov said.

Late on September 20, Russian troops once again launched guided bombs on Kharkiv. Three districts of the city came under attack, with 15 people injured, according to the Kharkiv Regional Prosecutor's Office and Mayor of Kharkiv Ihor Terekhov.

According to the Kharkiv Oblast Prosecutor's Office, Russian Su-34 jets launched three guided bombs from across the border in Russia's Belgorod Oblast.

Four Russian soldiers have been charged by the Kremlin with killing a US citizen. Russell Bentley, 64, who fought alongside pro-Putin rebels in eastern Ukraine, was tortured and murdered by Russian servicemen, Kremlin investigators said on Friday.

A Texan soldier fighting for Russia was killed in the spring, and Russia has said four Russian service members are to blame.

Russell Bentley, a pro-Kremlin American man who fought against Ukraine in 2014 and was killed under previously unknown circumstances in April, was tortured to death by Russian soldiers, Russia's Investigative Committee said on Sept.

Russian lawyer Anatoly Blinov has been arrested in Poland for allegedly organizing attacks on allies of Alexei Navalny.

A Russian citizen suspected of directing the beating of Leonid Volkov - an exiled top aide to late Russian opposition leader Alexei Navalny - was arrested in Poland, the National Prosecutors' Office said in a statement on Friday.

A Russian man has been charged in Poland over a hammer attack in neighbouring Lithuania on a top aide of late Russian opposition leader Alexei Navalny earlier this year, prosecutors said on Friday.Prosecutors said they were investigating a total of eight people in the case -- six Poles,