“We will carry on supplying Ukraine … with weapons, funding and humanitarian aid, until we have achieved our long-term goal, which must be so to fortify Ukraine that no one will ever dare to attack you again,” he told Ukrainian lawmakers.

The new military support, which will include electronic warfare equipment, a counter battery radar system, GPS jamming equipment and thousands of night vision devices, is the latest defensive aid from London.

Last week, it announced plans to send Ukraine armoured vehicles able to fire missiles against invading Russian aircraft, on top of previous contributions that have included anti-tank missiles, air defence systems and tonnes of plastic explosives.

The UK will also dispatch in the coming weeks heavy lift Unmanned Aerial Vehicle (UAV) systems “to provide logistical support to isolated forces” Johnson’s Downing Street office said ahead of the address.

Meanwhile, more than a dozen new specialised Toyota Land Cruisers are headed to Ukraine to help protect civilian officials in the country’s east and evacuate people from frontline areas, it added.

The Kremlin has criticised Western countries as they step up donations of military hardware, saying they risk escalating the conflict and warning Russia has the right to respond to any direct interventions.

On the diplomatic front, Britain is also reopening its embassy in Kyiv, with its top envoy there Melinda Simmons telling the UK Sunday newspaper “The Observer” that it “feels like the right place to be”.