By Hari Kishan and Jonathan Cable BENGALURU (Reuters) – Global stock markets were already headed for a volatile year with modest gains even before the latest escalation of the Russia-Ukraine crisis, according to a Reuters poll of around 120 equity market analysts and brokers around the world. Russian President Vladimir Putin’s decision on Monday to recognise two breakaway regions in eastern Ukraine and deploy troops there has deepened Western fears of a major war in Europe and made the outlook much more difficult to predict. With most central banks around the world now on the move chasing cons…