By Kylie MacLellan and William James LONDON (Reuters) -Britain on Tuesday imposed sanctions on Gennady Timchenko and two other billionaires with close links to Vladimir Putin after the Russian president deployed military forces into two breakaway regions of eastern Ukraine. British Prime Minister Boris Johnson said Russia was heading towards “pariah status” and that the world must now brace for the next stage of Putin’s plan, saying that the Kremlin was laying the ground for a full-scale invasion of Ukraine. He told parliament that five banks – Rossiya, IS Bank, GenBank, Promsvyazbank and the …