Stay up to date with notifications from The Independent Notifications can be managed in browser preferences. All News Sport Culture Lifestyle Related: Trump makes baseless claim Kyiv is ‘militarily defeated’ after phone call with Putin Russian President Vladimir Putin has reportedly heightened his security measures due to fears of assassination, according to a leaked European intelligence report. These precautions include spending weeks in an underground bunker in the Krasnodar region and subjecting staff, such as bodyguards and cooks, to thorough screening and restrictions on personal devices. The increased security follows the killing of General Fanil Sarvarov in December and alleged unverified attempts by Ukraine to attack Mr Putin's personal residence. The Institute for the Study of War (ISW) has observed corroborating evidence of enhanced security, including the deployment of additional air defence systems near Putin's residences.…