New Delhi, Sept. 15 -- Ukrainian President Volodymyr Zelensky on Sunday accused Russia of "testing" NATO's resolve after a Russian drone entered Romanian airspace during an attack on Ukraine, warning that Moscow seeks to "bring the war" to Poland, the Baltic states, and other allies.

Romania, a NATO and EU member, strongly condemned the drone incursion and summoned Russia's ambassador Vladimir Lipaev to Bucharest. The foreign ministry said it lodged a "strong protest" over the "unacceptable and irresponsible act" that violated Romania's sovereignty and posed a "new challenge" to Black Sea security.

The Romanian defence ministry confirmed the drone was a Russian Geran model that entered its airspace on Saturday, circling for nearly 50 mi...