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With the U.S. and Russia warming relations and Europe feeling sidelined, questions loom over Ukraine's future. CBS News contributor and retired Lt. Gen. H.R. McMaster, former national security adviser to President Trump, joins "CBS Mornings Plus" to discuss the evolving landscape. A new Harvard Business Review article highlights the impact of "meeting hangovers," with research showing they disrupt workflow and productivity. UNC Charlotte professor Steven Rogelberg, an expert on workplace meetings, shares solutions to make meetings more effective. Research shows up to 70% of adults over 65 struggles with chronic sleep issues. Board-certified sleep psychologist Shelby Harris shares expert tips for improving sleep at any age. From stunning gowns to bold fashion statements, Elle Magazine's Claire Stern Milch breaks down the most memorable red-carpet moments from last night's Oscars.