Economic data, retail earnings and geopolitical worries will be front and center for investors and traders in the week ahead. NATO and Ukraine said their alliance detected an “incursion” of vehicles from Russia, causing financial markets in the United States and Europe to drop sharply on Friday afternoon, while oil prices spiked. The tension between Russia and Ukraine will be monitored closely by investors and traders in the Week Ahead, in addition to key housing data along with consumer and tech Earnings, TheStreet’s Jill Malandrino points out. Consumer spending trends will be key with several big name retailers on tap to report quarterly results: Home Depot, Lowe’s, Target, The Gap, J.M. Smucker and Hain Celestial Group. There will also be a few big tech companies reporting quarterly results: Hewlett-Packard, Intuit, salesforce.com and GameStop.