Sen. Rob Portman (R-Ohio), a leading Senate advocate for supporting Ukraine’s war against Russia, crossed into Ukraine Sunday and called on the Biden administration to step up its shipments of artillery. Portman announced his visit while at the Ukraine-Moldova border crossing at Palanca. “I also had the opportunity to speak with several Ukrainians crossing the border and hear about their concerns about what Russia was doing to their country,” he tweeted. Portman also met with senior U.S. military officials and allies in the region, traveling to Stuttgart, Germany, and Bucharest, Romania. “Based on my briefings and discussions this weekend in...