Greece's Prime Minister Alexis Tsipras is to hold an emergency government meeting at midday London time to discuss the failure of the latest round of discussions with its creditors to help stop the country tumbling into bankruptcy.Talks between Greece and its creditors over the weekend yet again failed to resolve the impasse over reforms, with European officials blaming Greece for failing to offer concessions in return for a final tranche of desperately-needed financial aid. Standard Pacific (SPF) and Ryland Group Inc (RYL) said they would merge to become the fourth-largest homebuilder in the United States. The merged company would have a market capitalization of about $5.2 billion and an enterprise value of about $8.2 billion and would own or control about 74,000 homesites, the companies said in a statement on Sunday. United Technologies (UTX) said on Monday it plans to sell or spin off helicopter maker Sikorsky Aircraft by the end of the third quarter this year after a strategic review of the business. The unit, best known as the maker of Black Hawk helicopters, is one of the largest suppliers in the sector, with $7.5 billion in sales in 2014. It is the main supplier of helicopters to the U.S. Defense Department.