WASHINGTON (AP) — Presidents Joe Biden and Emmanuel Macron have vowed to maintain a united front against Russia amid growing worries about waning support for Ukraine in the U.S. and Europe. Biden on Thursday also signaled that he may be willing to tweak aspects of his signature climate legislation that have raised concerns with France and other European allies. While Biden honored Macron with a fancy state dinner Thursday evening, the glamour and pomp of the visit has been shadowed by Macron’s criticism of Biden’s climate legislation and the challenges both leaders face amid the mounting costs of keeping military and economic aid flowing to Kyiv.