EXCLUSIVE — President Joe Biden vowed on Thursday that the United States would continue to back Ukraine for “as long as it takes” to stop Russia’s war, but the public is showing signs that its appetite for assistance has limits.

Speaking at the close of the NATO meeting in Madrid, Biden said Americans should expect to pay record-high gas prices until Russia is defeated in Ukraine. “As long as it takes,” Biden said, “so that Russia cannot in fact defeat Ukraine and move beyond Ukraine.”