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The recurrent nova RS Oph underwent a new outburst on August 8, 2021,reaching a visible brightness of V = 4.8 mag. Observations of the 2021 outburstmade with the high resolution UVES spectrograph at the Kueyen-UT2 telescope ofESO-VLT in Paranal enabled detection of the possible presence of 7Be freshlymade in the thermonuclear runaway reactions. The 7Be yields can be estimated inN(Be)/N(H) = 5.7 x 10^(-6), which are close to the lowest yields measured inclassical novae so far. 7Be is short-lived and decays only into 7Li. By meansof a spectrum taken during the nebular phase we estimated an ejected mass ofabout 1.1 x 10^(-5) Msun, providing an amount of about 4.4x 10^(-10) Msun of7Li created in the 2021 event. Recurrent novae of the kind of RS Oph maysynthesize slightly lower amount of 7Li per event as classical novae, but occur10^3 times more frequently. The recurrent novae fraction is in the range of10-30% and they could have contributed to the making of 7Li we observe today.The detection of 7Be in RS Oph provides further support to the recentsuggestion that novae are the most effective source of 7Li in the Galaxy.

7Be detection in the 2021 outburst of RS Oph