Geneva, Switzerland (CNN) — US President Joe Biden said he had discussed the cases of two Americans detained in Russia during his meeting with Russian President Vladimir Putin on Wednesday, pledging to "follow through" on that discussion. "I raised the case of two wrongfully imprisoned American citizens, Paul Whelan and Trevor Reed," Biden said during a news conference Wednesday following the summit in Geneva. "The families of the detained Americans came up and we discussed them. We're going to follow through with that discussion. I am not going to walk away on that," he added. A senior State Department official...