Ukraine's northeastern front could decide new battle lines

Grueling artillery battles have stepped up in recent weeks in the vicinity of Kupiansk, a strategic town on the eastern edge of Kharkiv province. Triumph in Kupiansk could decide future lines of attack for both sides: If Russia succeeds in pushing Ukrainian forces west of the river, it would clear the path for a significant offensive farther south. If the Ukrainian defence holds up, it could reveal Russian vulnerabilities and enable a counteroffensive.