Both these pieces were likely made by Russian factories in the early 19th century though only one has a factory mark.
I believe that the building behind the fountains on the cup is the Peterhof Palace in St. Petersburg.
Peterhof was originally built for Peter the Great in the early 18th century. Successive Czars kept adding to its splendour which makes it difficult to pinpoint this exact view. The palace grounds are known for the many fountains, sixty in the Grand Cascade alone with still more throughout the grounds. The facade of the main palace building, which this cup shows, was added by Empress Elizabeth, daughter of Peter I.
The style of this cup dates it to the period of Alexander I (1801 – 1825). It does not have a factory mark. It has incised marks that look like initials and numbers. It could be Batenin or the Imperial Porcelain Factory. Research ongoing.
The jug has the impressed mark for Batenin used between 1832 and 1838. The opening pages of the Batenin Kornilov book show a print of this very fountain with the name of Alexander I underneath, so perhaps his addition to the palace grounds. The book also shows a cup and saucer dated 1820 enamelled with an alternate view of this fountain.
On both pieces, it looks as though the artist scratched through the layers of freshly painted enamel down to the glaze to express the water element.
Cup 12.4 cm in height to top of handle.
Jug 14.1 cm in height to top of handle.