With Meladze she recorded four singles: "Spektakl okonchen" ("The Play Is Over"), "Net" ("No"), "Navek" ("Forever") and "Shagay" ("Stride").

[4] On 25 July 2015, she performed "A Million Voices" as the closing song of the 2018 FIFA World Cup qualifying draw in Saint Petersburg, shown on television worldwide.

Gagarina achieved three top placements on the first five-week of shows before finishing last in her sixth show, which was the Challenge round; Gagarina would have been eliminated per the competition rules but was instead saved after the Challenger of the week was unsuccessful in beating a majority (4) of the seven singers.

In the Finals Rush Hour, she performed a duet with Chinese singer Geng Sihan, singing the song "Shallow".

In the first round of the final, she sang "We Are the World" alongside Kazakhstan's Junior Eurovision Song Contest 2018 participant Daneliya Tuleshova, Filipino-Canadian singer Darren Espanto and Chinese rapper Air Ari.

In 2021, she teamed up with fellow Eurovision 2015 contestant Måns Zelmerlöw to record the official song, "Circles and Squares", for the 2021 World Figure Skating Championships.

[13][14][15][16] On 18 March 2022, Gagarina sang at a pro-government rally held at the Luzhniki Stadium in Moscow celebrating the eighth anniversary of the annexation of Crimea by the Russian Federation from Ukraine and endorsing Russia's invasion of Ukraine that started the previous month.

[19] The Presidential Administration of Russia put Gagarina on the list of singers who were recommended to be invited to state-sponsored events.

[25] On March 18, 2022, she performed in Luzhniki at a rally-concert in honor of the anniversary of the annexation of Crimea under the title "Za world without Nazism!

In March 2022, Latvia and Estonia banned Gagarina from entry for supporting Russia's invasion of Ukraine.

On 3 February 2023, Gagarina was placed on Canada's sanctions list as being involved in the dissemination of Russian disinformation and propaganda.

[32][33] Earlier, Gagarina was included by FBK in the list of corrupt and warmongers, with a proposal to impose international sanctions against her because of her participation in concerts in support of the war against Ukraine.

[34][35] In late June 2024, Gagarina was included in a European Union sanction package along with other Russian artists who support the war.

Following this, Spotify removed the songs and profiles of those artists, while YouTube blocked their channels in early July.