La Dichiarazione di partenariato centenaria conclusa tra Ucraina e Gran Bretagna consente il posizionamento di basi militari britanniche in Ucraina.

In fact, it says nothing about such bases, only some unclear wording.

The Constitution of Ukraine currently prohibits creation of new foreign military bases on Ukrainian soil; and it can’t be changed during the war time.

Of course, it would be great for Ukraine in this situation to have the UK military base… but that’s not an option for, about, a year after the ceasefire, at least.

If we get actual Nato (or equivalent future group) to place tripwire troops, we may actually get a real period of peace. This is because Putin won’t be able to restart the war (without pulling other countries directly into the conflict) as soon as his army is rebuilt, which I guarantee is the current plan.