Truss and Kuleba said it was “imperative that the G7 and NATO show this week that their commitment to Ukraine will never be surpassed by Putin’s determination to seize it.”
“This means increasing and accelerating its supply of heavy weapons, continuing to sanction all those colluding in the Putin war and completely cutting off Russian energy imports,” they added.
Although other world leaders have also visited Zelensky in Kyiv, Johnson has tried to portray Britain as Ukraine’s closest ally.
“The United Kingdom, the United States and other European leaders want to see the same thing: a democratic, sovereign and prosperous Ukraine that is capable of defending itself from further aggression,” the prime minister’s official spokesman said on Saturday.
“The prime minister visited Kyiv last week to discuss with President Zelensky, who made it clear that Ukraine has no interest in ceding sovereignty.”
The UK is also committed to securing another £ 429 million in World Bank loans to Ukraine amid concerns that its government could collapse in the autumn without further support.
The pledge raises the UK’s total commitment to £ 1.5bn, including £ 1.3bn in loan guarantees and £ 220m in direct humanitarian aid.
This week world leaders will converge first in Munich for the G7 summit, then in Madrid for a full conference of NATO members.
Representatives from Finland and Sweden are also expected to join a meeting to discuss their accession to NATO.
Leaders will discuss the impact of the war in Ukraine on the global economy, food security and the future of Western alliances.
Ahead of the summits, Johnson said: “Future generations will be admired and inspired by Ukraine’s truly heroic resistance to Putin’s barbarism.
“Ukraine can win and will win. But they need our support to do so. Now is not the time to give up Ukraine.
“The UK will continue to support Ukraine every step of the way, because we know that its security is our security and its freedom is our freedom.”