Ukraine-Russia tensions escalate with drone strikes and oil depot fire.

Oil depots in Russia and Ukraine were set ablaze in drone attacks as both sides escalate their attacks on infrastructure ahead of Ukraine's planned spring counter-offensive to end Russia's invasion. Russia blamed a Ukrainian drone for a huge fire at an oil terminal on its side of the bridge to occupied Crimea, while Ukraine says destroying infrastructure supporting the Russian military in Ukraine is part of its preparation for the planned ground assault. The Federal Security Service (FSB) said it had arrested seven people connected with Ukrainian intelligence and accused them of planning "a series of high-profile sabotage and terrorist acts" in the annexed peninsula.