The video was posted on Twitter by El Mundo.

Este es el momento en el que se ha interrumpido abruptamente la rueda de prensa en la que iba a participar Pedro Sánchez en Lituania por una amenaza real de la Fuerza Aérea Rusa https://t.co/lAKYm0v7Lgpic.twitter.com/TsLzolvK34

- EL MUNDO (@elmundoes) July 8, 2021

As specified, the event was interrupted due to the urgent departure of two NATO aircraft, allegedly to intercept the Russian one.

There is no official confirmation of this information.