Russia has unveiled a new nuclear submarine, Khabarovsk, built to carry the Poseidon underwater nuclear drone — a weapon some officials have called a “doomsday missile” capable of devastating coastal nations.

A new report from the United Nations accuses Russia of committing crimes against humanity by attacking civilians and civilian infrastructure with drones, as well as committing war crimes through the forcible transfer of people.

Ukraine has rolled out a video game-style rewards system for its drone pilots, giving them new weapons and upgrades for every successful kill against Russian invaders, according to a new report.

The announcement comes as part of nuclear messaging from the Kremlin, which has resisted Western pressure for a ceasefire in Ukraine.

Several European countries are working with Ukraine to create a 12-point plan to end the war with Russia, Reuters reports.

Last week, the US imposed new sanctions on Russia's two largest oil producers, Lukoil and Rosneft, expanding restrictions already in place from the European Union and the UK over the war in Ukraine. The fresh measures have forced Indian buyers to reassess supply routes and payment mechanisms.