BRUSSELS — Treasury Secretary Janet L. Yellen urged European nations on Tuesday to step up their spending to support Ukraine as Russia’s attacks on the country’s critical infrastructure showed few signs of abating.The United States and Europe have coordinated closely in enacting sweeping sanctions against Russia in the nearly three months since its president, Vladimir V. Putin, ordered an invasion. But they have been less aligned on the need to help prop up Ukraine’s economy and to assist with its rebuilding once the war ends.Congress has already approved a $13.6 billion emergency spending package for Ukraine and is expected to approve another $40 billion worth of aid. While the European Union and international financial institutions have also been making large aid contributions, Ms. Yellen said that more must be done.“I sincerely ask all our partners to jo …
