Prime Minister Tony Abbott has put Moscow on notice, warning that Australia will consider banning uranium sales in the event of a Russian incursion into Ukraine. Mr Abbott said on Saturday Australia would not accept that any Russian troop movement across the border could have a humanitarian purpose. "Everything's on the table," he said when asked about the prospect of extending sanctions to include uranium. "Our message to President (Vladimir) Putin is, `hold your forces back'," Mr Abbott said. "Any move by Russian forces across the border would be an invasion, pure and simple...