[3][4] Under the terms of the agreement, the United Kingdom will sell two refurbished Sandown-class minehunters to Ukraine and produce eight small missile warships for the country.

[6] In an account partially contradicted by the UK government, the Ministry of Defence of the Russian Federation and border guards said they fired warning shots from coast guard patrol ships and dropped bombs from a Sukhoi Su-24 attack aircraft in the path of Defender after, according to the Russian Defence Ministry, it had allegedly strayed for about 20 minutes as far as 3 km (2 miles) into waters off the coast of Crimea, which Russia annexed in 2014 in a move mostly unrecognised internationally.

[15] On 27 June, secret documents relating to the passage of HMS Defender through Ukraine's territorial waters were discovered at a bus stop in Kent.

[17] From 15:30 to 20:30 on 24 June, the Russian Air Force conducted a series of "mock attacks" on the Dutch frigate HNLMS Evertsen that had been sailing in the Black Sea with HMS Defender.

[21] Deputy Russian Foreign Minister Sergei Ryabkov warned that Russia would drop bombs "not only in its path, but also on target" if British vessels were involved in future incidents.