About 130 U.S. soldiers are returning to their bases after being deployed to a remote Alaska island amid a spike in Russian military activity in the area.

The actions follow a series of Russian air operations that skirted Alaskan airspace and as Russian and Chinese warships conducted joint exercises across the Pacific.

About 130 U.S. soldiers are returning to their bases after being deployed last week to a remote Alaska island with mobile rocket launchers amid a spike in Russian military activity off the western reaches of the U.

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.

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,