Tinkoff is the world's largest bank that is fully online, with more than 10 million customers across Russia. : MOSCOW (Reuters) - Russian bank TCS Group Holding is in talks to sell its online bank Tinkoff to Russian internet group Yandex for $5.48 billion (£4.30 billion), the two companies said on Tuesday. The idea was first publicly floated last year when Oleg Tinkov, founder of Russia's TCS group, suggested https://uk.reuters.com/article/idUKL8N23E2JS to Yandex's chief executive that they combine his bank with Yandex, known as Russia's answer to Google.