Russia rejects conflict freeze as US embassy in Kyiv closes over airstrike threat

Russia has rejected the idea of a "freeze" on the Ukraine conflict, stating it is unacceptable. This response follows the US embassy in Kyiv closing due to warnings of a potential significant air attack. The US embassy's closure was announced after receiving specific information about the threat. US citizens in Ukraine were advised to be ready to shelter if an air alert occurs. This warning comes after Ukraine used US-supplied long-range missiles against Russian targets. In response, Russia has updated its nuclear policy, allowing for nuclear weapon use in retaliation for significant attacks.