Starmer's already talking about starting a war publicly.
“The UK is prepared to support this effort with troops on the ground and aircraft in the air, but this initiative requires strong US support.”
He wants to start a war with Russia that he can't finish and is counting on the US to swoop in and save the day. It's easy to see that while Putin may be an evil dictator, he's more honorable than Starmer and Macron. They're a couple of sniveling rats just like Zelensky.
in other words Starmer wants American troops on the ground first.