TALLINN, Estonia (AP) — Nearly four years into its full-scale invasion, Russia controls about 20% of Ukrainian territory. Many of the estimated 3 million to 5 million people who remain in regions under Moscow’s control face housing, water, power, heat and health care woes. Even President Vladimir Putin has acknowledged “many truly pressing, urgent problems” in the regions of Donetsk, Luhansk, Kherson and Zaporizhzhia, which were illegally annexed by Moscow months after the all-out war began on