By Sabine Siebold and Charlotte Van Campenhout BRUSSELS (Reuters) -European Union countries started discussing on Monday how to treat Russians trying to get into the bloc to avoid President Vladimir Putin’s call-up for the war in Ukraine. The number of draft-age men heading abroad since Putin called up 300,000 reservists on Wednesday has posed a dilemma for EU members, particularly eastern states, that had been limiting Russians’ access in response to the war. It has also raised fears of increased traffic and possible security risks at frontiers. EU leaders gave mixed messages ahead of a meeti…