The United States has obtained new intelligence that suggests Russia is planning to stage an attack that it would falsely blame on Ukraine to justify invading the country, possibly as early as next week, according to multiple U.S. and European officials who have reviewed the intelligence or been briefed on it.

The intelligence about a “false flag” operation was discussed in a quickly convened meeting in the White House Situation Room on Thursday evening and helped prompt renewed calls from the Biden administration for all Americans to leave Ukraine immediately, according to officials familiar with the matter who spoke on the condition of anonymity to discuss sensitive intelligence.

The precise timing and nature of the Russian operation was unclear. The United States had already accused Russia of planning to film a fake attack against Russian territory or Russian-speaking people in eastern Ukraine. The new intelligence is distinct from that alleged operation, the officials said…

“Moscow is actively trying to create a casus belli,” or a justification for war, a Western official said.