NATO defence ministers have agreed to ramp-up security assistance and training for Ukraine, with the alliance’s Secretary-General Jens Stoltenberg conceding Russia has increased hostilities towards member states. The alliance says it has increased its defences through more intelligence exchange, enhanced protection of critical infrastructure, including undersea and in cyber space, and further restrictions on Russian spies. “In recent weeks, we have seen a surge of sabotage, cyber-attacks, instrumentalised migration and other hostile actions by Russia,” Stoltenberg said at a press conference at…