Nissan Motor is proposing to buy about 20 per cent of Chrysler and bring the troubled automaker into the Franco-Japanese alliance with Renault SA, the 'Detroit News' reported on Wednesday, citing sources familiar with the situation.The offer is now before private equity firm Cerberus Capital Management CBS.UL, which holds 80 per cent of Chrysler, the paper said. Citing another source close to the talks, the paper also said Cerberus founder and chief executive Stephen Feinberg favors a deal with General Motors.