Ensign of the Russian Navy
The Russian Navy ensign, also known as St. Andrew's flag, was the ensign of the Navy of the Russian Empire, and is the naval ensign of the Russian Federation since 1992, and the banner of the Navy of the Russian Federation since 2000.
Russian Navy Ensign with the badge of the Order of Nakhimov and the ribbon of Saint George on Russian cruiser Moskva. Sevastopol, 22 July 2016
A saltire, also called Saint Andrew's Cross or the crux decussata, is a heraldic symbol in the form of a diagonal cross. The word comes from the Middle French sautoir, Medieval Latin saltatoria ("stirrup").
Coin of Theodosius II (425–429), showing the emperor with globus cruciger and with the same vexillum
Saint Andrew martyred on a decussate cross (miniature from an East Anglian missal, c. 1320)
Quarterly 1st & 4th: Barry of six [seven] vair and gules; 2nd & 3rd: Gules, a saltire vair (Henry Beaumont of Devon, d.1591)
Papal coat of arms for Pope Innocent VIII with the Keys of Peter saltirewise (Wernigerode Armorial, c. 1490)