But were not at war ffs!
Although with this completely unnecessary, provocative, macho posturing that might not last too long.
This posturing goes on all the time, the Russians do it quite regularly to us trying to send long range bombers into our airspace, and US Navy in the South China Sea after China has stolen land/seabed off smaller nations. For example, recently the Russians tried pushing the boundaries with the Queen Elizabeth taskforce while it was supporting missions in Iraq against Daesh etc.
It is necessary to back our ally, Ukraine, after they had their land stolen by Russia or should we just ignore that the Crimea was stolen?
It is also necessary as Russia has previously tried to block access to other nations to the surrounding international waters/Black Sea with threats hence why such patrols involving NATO allies has become a regular thing. I think we have sent patrols annually now for the last 3 or 4 years with US and French Navy partners.
And journalists don't only embed in war, it is fairly common in war or peace. After all there was a TV series following Royal Navy ships in recent years that went into the Med, Black Sea etc.
Further, the Journalist may have been there as days before we signed a deal on new ships with Ukraine. 2 Missile ships to be built in the UK and 6 of the same to be made in Ukraine all for the Ukrainian Navy. They are also buying 2 old Royal Navy Minesweepers which will be refitted in the UK before joining the Ukrainian Navy.
This is probably why the Russians have got noisy about something that is quite common. After all a year or so a go a Russian fleet did similar when it went through the English Channel.