Russian Finance Minister Anton Siluanov has said in a conference of the nation's big business lobby that the worst is over for the country's economy and the financial market is showing momentum toward growth following global oil declines and Western sanctions.The conference in Moscow was organized by the Russian Union of Industrialists and Entrepreneurs. President Vladimir Putin urged Russian billionaires and business leaders to bring money back to the country from offshore accounts. He warned that funds kept abroad could be frozen. The Russian leader has already announced a capital amnesty under which funds brought back to the country would not face questions on tax and other issues.