A major assault would be devastating for the almost three million people living in the northwestern province, many of them rebels and civilians who were moved out of other areas as they came back under regime control.
The UN and aid groups have warned that a full assault on Idlib could spark a humanitarian catastrophe on a scale not yet seen in Syria's seven-year-old conflict.
More than half of Idlib is controlled by militants from Syria's former Al-Qaeda affiliate, Hayat Tahrir al-Sham (HTS), while much of the rest is held by rebels backed by Turkey.
Pompeo and Cavusoglu "agreed that any Assad regime military offensive in Idlib would be an unacceptable, reckless escalation of the conflict in Syria", said U.S. State Department spokeswoman Heather Nauert.
Syrian government warplanes struck the last rebel-held province of the country Tuesday. More than 350,000 people have been killed and millions displaced since Syria's war started in 2011 with the brutal repression of anti-government protests.
Since May 2017, Idlib has been protected by a partial ceasefire following a de-escalation agreement between Turkey, Iran, and Russian Federation.
The world had been bracing for weeks for Assad regime forces to attack Idlib, where around 2.5 million civilians are living in opposition-held territory with no clear route of escape if fighting escalates.
The Britain-based Syrian Observatory for Human Rights said Tuesday that at least nine civilians, including five children from the same family, were killed in the Russian raids, while 10 more people were wounded.
Moscow has accused armed groups in Idlib of sending weaponised drones to attack the Hmeimim airbase that it uses in the adjacent province of Latakia.
Kremlin spokesman Dmitry Peskov reiterated Russia's position, calling Idlib a "hornets' nest of terrorists".
Russian presidential advisor Yuri Ushakov described the meeting as "very important".
The US says it will respond "swiftly and appropriately" if Syrian President Bashar Assad uses chemical weapons "again", suggesting that Damascus was behind an April "attack" which Moscow says was entirely staged.
Erdogan as well as the presidents of Iran and Russian Federation will meet on Friday in Tehran for a summit expected to focus on Idlib.
"Such an attack would be a reckless escalation of an already tragic conflict and would risk the lives of hundreds of thousands of people", said White House spokeswoman Sarah Sanders, warning the United States and its allies "will respond swiftly and appropriately".
The 21st overall pick in the 2008 draft, he has played for four different teams, averaging 12.8 points and 5.4 rebounds a game. Meanwhile, Knight hasn't played in an National Basketball Association game since February 2017 thanks to various injuries.
Mayor Mike Duggan announced at the service that he meant to have the city's riverfront Chene Park renamed in Franklin's honour. The singer died at her home in Detroit , Michigan, at the age of 76 after suffering from advanced pancreatic cancer.
The players, they show every supporter we want and can do the second half going forward with balance, and win the match. Of course, we need to add points but in each game we have improved a little bit more.
To applause, she continued: "The America of John McCain has no need to be made great again because America was always great". He made us better presidents , just as he made the Senate better, just as he made this country better.
Air pressure on the International Space Station has been restored to correct levels after a leak was repaired. Earlier this week, a small hole on the Russian side of the International Space Station (ISS) sprung a leak.
On Saturday, marchers in Charlottesville held peaceful demonstrations and people laid flowers on a makeshift memorial to Heyer . Charlottesville and state leaders are weighing in on how the August 11 and 12 anniversary weekend panned out in the city.
It's now unclear if Apple will save this announcement for later in the year or reveal all alongside its new range of phones. Apple has in each of the past six years hosted a press conference in early September to announce a new iPhone.
Bush and Obama are expected to offer eulogies at his funeral, to be held at the National Cathedral in Washington, D.C. Click through to McCain's official website for information on memorials and services happening soon.
President Donald Trump signed the 2019 National Defense Authorization Act which authorizes a top-line budget of $717 billion. While Trump praised the military during his remarks at New York's Fort Drum , the president did not address McCain .
The former White House aide stressed the small number of African-Americans who are working in his administration. Trump has denied this, saying on Twitter that "I don't have that word in my vocabulary, and never have".
President Donald Trump on Wednesday morning took to Twitter, as he often does, to lambaste some of his favourite targets: the U.S. WTO complaints begin with negotiations between the parties to the conflict.
Unai Emery has confirmed Petr Cech will keep his place in the Arsenal goal for Saturday's London derby against Chelsea . And Keown, who played under Wenger, saw a similar risky decision Emery made in his first competitive outing as manager.
Trump renews threat to withdraw USA from NAFTA
The U.S. and Mexico came to an agreement on a new pact last week, a deal which excluded America's northern neighbor. The negotiation tactics of the Trump administration is "a classic power play", says Evenett.
Korea Defends Women's Handball Title at Asian Games
In 2002 in particular, the Koreans brushed off Iran in straight sets to celebrate their second Asian Games title at home. Tottenham Hotspur forward Son Heung-min has moved one step closer to securing his exemption from military duty.
Aguero bags treble as rampant City hit Huddersfield for six
Pep Guardiola's City dazzled against the only side to stop them scoring at the Etihad Stadium in the league last season. Eduardo SALVIO and Franco CERVI who are both called-up for Argentina's friendly matches next month started for Benfica.
Aretha Franklin, Dead at 76, Recorded in Miami
Rhythm and blues singer Aretha Franklin performs at the inaugural gala for President Clinton in Washington on January 19, 1993. Sir Elton added, on Instagram: 'Her voice was unique, her piano playing underrated - she was one of my favourite pianists.