By Brian O’Connell With Putin’s tanks rolling through European streets, weapons makers are on the radar of many investors. Vladimir Putin’s invasion of Ukraine continues to dominate the headlines with the economic impacts quickly spilling over in oil, wheat and financial markets. Against that backdrop, analysts and columnists at TheStreet and Real Money are looking at these picks for “Stocks of the Week.” Lockheed Martin (LMT) $409.45. 5-day performance $5.96%;Northrop Grumman (NOC) $409.67. 5-day performance 4.71%.Defense industry companies are emerging front and center as stocks to watch for…