A tsunami alert has been issued following a powerful magnitude 8.7 earthquake off the coast of Russia. The US Geological Survey reported that the earthquake struck 136km east of Petropavlovsk-Kamchatsky, in Russia's far east. Authorities are monitoring the situation closely and urging residents in coastal areas to remain vigilant and follow safety guidelines. The extent of potential damage and the impact on surrounding regions are still being assessed. Further updates will be provided as more information becomes available.