Now that the US has given Ukraine the green light to use American-supplied long range missiles in Russia, what will the UK decide?
Ukraine’s President Volodymyr Zelensky has been pushing for permission from Washington to use the powerful US-made Army Tactical Missile System, known as ATACMS, to hit targets inside Russia.
UK defence officials for their part have been seeking US approval for Kyiv to use Storm Shadow missiles provided by Britain to hit military targets inside Russia.
But London has not been willing to go it alone and had been waiting for the White House to change its mind, which it did on Sunday.
The change of US policy paves the way for Ukraine to use Storm Shadow with fewer restrictions - something Ukraine has been requesting for months.