By Noor Zainab Hussain and Carolyn Cohn LONDON (Reuters) – AIG, one of the world’s biggest commercial insurers, is considering cutting cover for Russia and Ukraine, to shield itself from the risk of hefty claims as sanctions ratchet up and the war drags on, an insurance broker and a source familiar with the matter said. AIG is looking at adding exclusion clauses to policies for businesses operating in the region across a range of policies, according to the two sources who declined to be identified. Other major insurers are also looking to exclude Russia, Ukraine and even Belarus from a range o…