On Saturday I got a cover from Russia.
With great stamps:
50 years diplomatic relations with Singapore (whole set) (issued 25-06-2018)
It is a joint issue with Singapore.
with First Day Special Postmark
Inside was a mint version of the set on the cover and a Russian postcard.
The postcard shows the Otkritie Arena in Moscow. The Otkritie Arena was built between 2010 and 2014. It is mainly used for football matches like home matches of Spartak Moscow and occasionally matches of the Russian national team. Currently it is one of the venues of the FIFA World Cup. During the cup it is known as Spartak Stadium.
Thank You very much Ekaterina!