U.S. President Donald Trump on Tuesday slammed the "ignorant and insulting" response from Iran to his offer of talks, extended as the United States slapped new sanctions on the country's already crippled economy.

"Iran's very ignorant and insulting statement, put out today, only shows that they do not understand reality," he tweeted.

Sri Lanka's police Tuesday stepped in to prevent a local council from banning Muslim traders from a weekly fair in another backlash from the devastating Easter attacks blamed on Islamic extremists.

Iran will "resolutely" abandon more commitments under a 2015 nuclear deal with world powers on July 7, Fars News Agency reported on Tuesday quoting a "note" from a top security official.

NATO will this week decide how to respond to Russia's violation of a key Cold War arms treaty, alliance chief Jens Stoltenberg said Tuesday, insisting any measures would be defensive.

The Intermediate-Range Nuclear Forces (INF) treaty is expected to formally collapse on August 2 after both Russia and the United States pulled out, dealing a blow to international arms control efforts.

U.S. drones have been a key tool in conflicts against insurgent organizations such as the Taliban and the Islamic State group, but Iran's downing of one of the aircraft highlights their limitations against more sophisticated adversaries.

NATO will launch its first strategy for space this week as the alliance heads beyond the skies to defend against the likes of China and Russia.

Britain urged Hong Kong on Tuesday to conduct an independent investigation into clashes between police and protesters, and suspended export licences for crowd control equipment.

The winner of the contest to replace Theresa May as leader of Britain's ruling Conservatives and prime minister will be announced on July 23, the ruling party said Tuesday.

Boris Johnson broke cover Tuesday after accusations of ducking scrutiny in his bid to become Britain's next prime minister, defending his Brexit strategy but saying it would be "unfair" to discuss his private life.

The U.S. drone shot down by Tehran last week was in Iranian airspace, the head of Russia's Security Council said Tuesday, despite U.S. claims to the contrary.