Icelandic volcano Eyjafjallajoekull whose...

Meanwhile, a Russian volcanologist, Artur Saltykovsky, told RIA Novosti that the Eyjafjallajokull ash could make a full circle around the globe.

"It cannot be ruled out that [the volcanic ash] could travel beyond the Pacific, reach America and could close [the circle] near Iceland," he said, also voicing fears that Katla could be triggered.

Air traffic in Europe is likely to begin returning to normal from Tuesday, although it is expected to be a lengthy process.

MOSCOW, April 19 (RIA Novosti)