Russia’s assault on Ukraine’s power grid will be discussed at a meeting involving officials from the Group of Seven nations as foreign affairs ministers gather for a NATO meeting on Tuesday in Bucharest.U.S. officials have said that Russia is targeting transmission stations that power Ukraine.From our correspondentsPressure builds to step up weapons tracking in Ukraine: House Republicans, who will hold a slim majority in the next Congress, have warned the Biden administration to expect far tougher oversight of the extensive military assistance it has given Ukraine.Most in Washington are in agreement that, generally, the push for more oversight is a good thing, writes The Post’s Karoun Demirjian, and the administration has worked in recent weeks to publicize its efforts to track shipments.But experts say it’s difficult to ensure an airtight account of all weapons shipments, which is likely to leave some critics unsatisfied."