THE The Kremlin said on Monday that the US decision to allow Ukraine to fire US missiles against targets in Russia marks a “new round of tensions” in the war.

On Tuesday, Russian President Vladimir Putin sign a revised national nuclear doctrine expanding the conditions under which Moscow can use its atomic weapons, making it easier to justify a strike against NATO countries.

Asked if the British government could take similar precautions, British government minister Peter Kyle said that the British government is monitoring the situation “very closely”.

“We have very good relations with the government in kyiv and with the United States. We will do everything we can to keep British citizens safe,” he said.