Russia reports a Ukrainian strike on an oil refinery on Thursday, after Ukraine's president says a pause is over following fresh Russian attacks.
It is the "backbone of military communications in Ukraine" that provides vital high-speed internet to forces across the country.
A search and rescue operation is under way in the Black Sea after a suspected drone attack on the Wine Trader tanker.
Ukraine says Starlink access has improved but it is still facing speed limits which are disrupting its battlefield "missions".
Prime Minister Andy Burnham welcomed President Zelensky to Downing Street on Wednesday, as Ukraine's leader looks to shore up his European allies five years into Russia's war on Ukraine.
The UK's prime minister meets with Volodymyr Zelensky after a rocky week for the Ukraine president.
The Ukrainian president visited London in an effort to bolster support among European allies following a row with Donald Trump.
It comes as the prime minister meets President Zelensky at Downing Street.
Four years after the attacks, Serhii Kuznetsov appears in court accused of a plot to destroy Russia's gas pipelines to Germany.
Elon Musk's system allows Kyiv to protect Ukrainian skies and effectively guide drones to Russian targets.
BBC Ukraine Correspondent Dan Johnson is in Kyiv, where at least three people were killed in overnight strikes.
The Ukrainian president says the ballistic missile strikes came with "no early warning from our partners".