Unlike its predecessor, Operation Interflex takes place within the United Kingdom and is supported by contingents from international partners.

The operation ran concurrently with similar efforts of international partners in the Joint Multinational Training Group — Ukraine (JMTG-U).

[2] In February 2022, amid a buildup of Russian forces on the Ukrainian border, the UK supplied Ukraine with anti-tank weapons; training was provided for these as part of Operation Orbital.

[3] On 17 February 2022, the UK announced that Operation Orbital had been suspended due to fears of Russia launching a "no notice" attack.

This inspired the rest of their platoon to join the fight and, after the Russians had been repelled, the commander asked them why they had done this, to which they replied: “This is what we were taught to do in UK training.”[14] The Royal Navy is also contributing to the programme with Ukrainians being trained in maritime skills, such as damage control, minehunting and weapon drills.

[16] On 15 January 2023, the British government announced another package of military aid for Ukraine, which included 14 Challenger 2 main battle tanks.

[18] On 8 February 2023, President of Ukraine Volodymyr Zelenskyy visited Lulworth Camp along with British prime minister Rishi Sunak, where he met Ukrainian troops who were being trained to use Challenger 2 tanks.

[20] In July 2023, the Royal Navy Diving and Threat Exploitation Group (DTXG) taught Ukrainian Navy divers and personnel who operate uncrewed underwater vehicles (UUVs) how to find and safely neutralise free-floating buoyant mines, ground mines and improvised explosive devices in, on, and around the water at Loch Ewe in Scotland.

UK Defence Secretary Grant Shapps also disclosed that there were ongoing discussions on moving the British-led training programme "into Ukraine".

[35] On 18 January 2024, Kosovo's Ministry of Defence announced that a contingent of 26 instructors would be sent to the UK to join the program to assist with the training of Ukrainian soldiers.