WASHINGTON (Reuters) -U.S. President Joe Biden spoke to British Prime Minister Rishi Sunak on Monday about the Red Sea, Gaza and Ukraine. “They talked about what’s going on in the Red Sea and the need for a continued international multilateral approach to disrupting and degrading Houthi capabilities,” White House spokesman John Kirby told reporters in Washington. Biden and Sunak also spoke about the need to bring down the number of civilian casualties and to increase the flow of humanitarian assistance into Gaza as well as the urgent need for supplemental funding and support for Ukraine in its…