The Kremlin says Russian President Vladimir Putin has accepted North Korean leader Kim Jong Un's invitation for Russian officials to visit North Korea, after the Russian president hosted Mr Kim at a Russian space centre and held talks on bilateral ties. Key points: Kim Jong Un met with Vladimir Putin in Russia earlier this week to discuss greater cooperation Kim Jong Un met with Vladimir Putin in Russia earlier this week to discuss greater cooperation The visit stoked concerns that North Korea could help Russia bolster its military in Ukraine, and provide Kim with sensitive missile technology The visit stoked…