India, Nov. 12 -- Russia and Ukraine agreed to a large exchange of prisoners of war, both sides said Wednesday as two days of US mediated talks concluded with no major breakthrough on ending Moscow's nearly 5-year-old full-scale invasion. The talks lasted just under two hours on Wednesday, after a four-hour session the previous day. Hopes had been low for any significant development in the first meeting in nine months between the delegations. Russia and Ukraine have from time to time swapped POWs but have remained far apart in their demands for accepting a peace settlement. US officials say they are determined to revive Washington's peace efforts that so far have failed to deliver significant results. Along with postwar security guarantees ...