British Prime Minister Rishi Sunak is calling on his G7 allies, who will meet today by video conference on the one-year anniversary of Russia’s military invasion of Ukrainian territory, to speed up arms and ammunition deliveries, especially artillery, to Kiev and supply Ukrainian armed forces with longer-range weapon systems.

“For Ukraine to win this war — and to hasten that day — it must gain a decisive advantage on the battlefield,” the Tory government leader will say at the leaders’ debate, according to his services.

“Instead of taking a progressive approach, our approach should be to act more quickly in terms of artillery, tanks and air defense,” he will add.

Mr Sunak, who will observe a minute’s silence in Downing Street today flanked by Ukrainian military personnel, will also call on G7 leaders to send “longer-range weapons” to Kiev.

According to Number 10 Downing Street, which recently announced that it has begun training Ukrainian pilots on Western-style aircraft, the British prime minister will repeat his proposal to offer support “to countries capable of delivering aircraft to Ukraine to help it directly in this war”.

Britain, the first country to promise to supply Ukrainian troops with heavy tanks, says it is open to the possibility of also sending them NATO-type aircraft, but has clarified that training their pilots will take up to three years.

The Ukrainian Air Force is based on Soviet-designed aircraft types.