By Andrius Sytas VILNIUS (Reuters) -Smuggling balloons floating over the border from Belarus have shut down the airport in Lithuania's capital Vilnius for four evenings over the past week, with authorities branding it a "hybrid attack" by the Kremlin ally.

Inga Ruginiene says she is taking the "strictest measures" over the balloons, used to transport cigarettes from Belarus.

Lithuania accuses Belarus and Russia of a "deliberate escalation of hybrid warfare" as balloons shut down major airport.

Authorities said the balloons are likely for smuggling, but blamed Belarus' leader, Alexander Lukashenko, for letting them float over.

Up to 25 small hot-air balloons, some carrying smuggled cigarettes, entered Lithuanian airspace late Saturday, forcing the shutdown of Vilnius Airport.

In two multicenter trials, separate balloon angioplasty platforms were noninferior to lithotripsy for treatment of calcified coronary lesions but substantially less costly.

The President of the European Commission, Ursula von der Leyen, has described the incursions of balloons from Belarus into Lithuanian airspace as "provocation" on Tuesday, incidents that have forced the closure of Vilnius International Airport for three consecutive nights.

Serial Guinness World Record-breaker David Rush teamed up with a YouTuber to earn the title for the most hits of a person with water balloons in three minutes.