British Prime Minister Theresa May and President Donald Trump in their call on Sunday discussed how Syria and its Russian and Iranian sponsors should call for an immediate ceasefire. | Luca Bruno/AP Photo Trump, May call Putin's statements on Russia's nuclear arsenal 'irresponsible'

President Donald Trump and British Prime Minister Theresa May agreed on Sunday during a phone call that Vladimir Putin's claim that Russia had nuclear weapons that could evade U.S. anti-missile defense systems was "irresponsible."

Putin on Friday announced that Russia has nuclear weapons that could get around defense systems, in addition to underwater drones and intercontinental missiles.


A Pentagon spokesperson later said U.S. officials weren't surprised by Putin's comments.

Tensions between Russia and the U.S. have increased over the past several years, and U.S. intelligence agencies have accused Russia of interfering in the 2016 presidential election.

May and Trump also discussed how Syria and its Russian and Iranian sponsors should call for an immediate cease-fire across war-torn Syria.

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Russia and the U.S. are supporting opposite groups in the Syrian war, with the Kremlin currently backing Syrian President Bashar Assad, while the U.S. backs certain rebel groups in the war.

In addition, Trump and May in their call affirmed that their two countries "will hold Russia accountable for compelling the Assad regime to halt attacks against civilian areas and for granting access to humanitarian relief in East Ghouta."