The UN fears the coup in Myanmar will make the plight of about 600,000 Rohingya Muslims still in the country worse, a UN spokesman said on Monday.
The Security Council said it planned to discuss the latest developments on Tuesday.
Myanmar's military seized power on Monday in a coup against the democratically elected government of Aung San Suu Kyi, who was detained along with other political leaders.
In 2017, a Myanmar military operation in Rakhine state on an anti-terrorist pretext sent more than 700,000 Rohingya Muslims fleeing into Bangladesh, where they remain in refugee camps.
UN Secretary General Antonio Guterres and western states accused the Myanmar military of ethnic cleansing, which it denied.
"There are about 600,000 Rohingya, those who remain in Rakhine state, including 120,000 people who are effectively confined to camps - they cannot move freely and have extremely limited access to basic health and education services," UN spokesman Stephane Dujarric said.
"So, our fear is that the events may make the situation worse for them."
The 15-member UN Security Council plans to discuss Myanmar in a closed meeting, diplomats said.
"We want to address the long-term threats to peace and security, of course working closely with Myanmar's Asia and Asean neighbours," Britain's UN ambassador Barbara Woodward, president of the council for February, said.
China, backed by Russia, shielded Myanmar from any significant council action after 2017.
Beijing and Moscow are council veto powers along with France, Britain and the United States.
China's UN mission told Reuters on Monday it hoped to find out more about the latest developments in Myanmar from the Tuesday briefing.
"It's also our hope that any move of the council would be conducive to the stability of Myanmar rather than making the situation more complicated," a representative of the Chinese mission said.
The Myanmar army said it had detained Ms Suu Kyi and others in response to "election fraud", handing power to military chief Min Aung Hlaing and imposing a state of emergency for one year.
The UN called for the release of all those detained, Mr Dujarric said.
He said Mr Guterres' special envoy on Myanmar, Christine Schraner Burgener, "remains actively engaged" and is likely to brief the Security Council.
The UN has long had a presence in Myanmar. Security Council envoys travelled there in April 2018 and met separately with Ms Suu Kyi and Min Aung Hlaing following the repression of the Rohingya.
Myanmar military coup - in pictures
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First-round leaderbaord
-5 C Conners (Can)
-3 B Koepka (US), K Bradley (US), V Hovland (Nor), A Wise (US), S Horsfield (Eng), C Davis (Aus);
-2 C Morikawa (US), M Laird (Sco), C Tringale (US)
Selected others: -1 P Casey (Eng), R Fowler (US), T Hatton (Eng)
Level B DeChambeau (US), J Rose (Eng)
1 L Westwood (Eng), J Spieth (US)
3 R McIlroy (NI)
4 D Johnson (US)
The Sand Castle
Director: Matty Brown
Stars: Nadine Labaki, Ziad Bakri, Zain Al Rafeea, Riman Al Rafeea
Rating: 2.5/5
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The biog
First Job: Abu Dhabi Department of Petroleum in 1974
Current role: Chairperson of Al Maskari Holding since 2008
Career high: Regularly cited on Forbes list of 100 most powerful Arab Businesswomen
Achievement: Helped establish Al Maskari Medical Centre in 1969 in Abu Dhabi’s Western Region
Future plan: Will now concentrate on her charitable work
A list of the animal rescue organisations in the UAE
Racecard
6pm: Al Maktoum Challenge Round 2 Group 1 (PA) $55,000 (Dirt) 1,900m
6.35pm: Oud Metha Stakes Rated Conditions (TB) $60,000 (D) 1,200m
7.10pm: Jumeirah Classic Listed (TB) $150,000 (Turf) 1,600m
7.45pm: Firebreak Stakes Group 3 (TB) $150,000 (D) 1,600m
8.20pm: Al Maktoum Challenge Round 2 Group 2 (TB) $350,000 (D) 1,900m
8.55pm: Al Bastakiya Trial Conditions (TB) $60,000 (D) 1,900m
9.30pm: Balanchine Group 2 (TB) $180,000 (T) 1,800m
Suggested picnic spots
Abu Dhabi
Umm Al Emarat Park
Yas Gateway Park
Delma Park
Al Bateen beach
Saadiyaat beach
The Corniche
Zayed Sports City
Dubai
Kite Beach
Zabeel Park
Al Nahda Pond Park
Mushrif Park
Safa Park
Al Mamzar Beach Park
Al Qudrah Lakes
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F1 The Movie
Starring: Brad Pitt, Damson Idris, Kerry Condon, Javier Bardem
Director: Joseph Kosinski
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Four stars
Milestones on the road to union
1970
October 26: Bahrain withdraws from a proposal to create a federation of nine with the seven Trucial States and Qatar.
December: Ahmed Al Suwaidi visits New York to discuss potential UN membership.
1971
March 1: Alex Douglas Hume, Conservative foreign secretary confirms that Britain will leave the Gulf and “strongly supports” the creation of a Union of Arab Emirates.
July 12: Historic meeting at which Sheikh Zayed and Sheikh Rashid make a binding agreement to create what will become the UAE.
July 18: It is announced that the UAE will be formed from six emirates, with a proposed constitution signed. RAK is not yet part of the agreement.
August 6: The fifth anniversary of Sheikh Zayed becoming Ruler of Abu Dhabi, with official celebrations deferred until later in the year.
August 15: Bahrain becomes independent.
September 3: Qatar becomes independent.
November 23-25: Meeting with Sheikh Zayed and Sheikh Rashid and senior British officials to fix December 2 as date of creation of the UAE.
November 29: At 5.30pm Iranian forces seize the Greater and Lesser Tunbs by force.
November 30: Despite a power sharing agreement, Tehran takes full control of Abu Musa.
November 31: UK officials visit all six participating Emirates to formally end the Trucial States treaties
December 2: 11am, Dubai. New Supreme Council formally elects Sheikh Zayed as President. Treaty of Friendship signed with the UK. 11.30am. Flag raising ceremony at Union House and Al Manhal Palace in Abu Dhabi witnessed by Sheikh Khalifa, then Crown Prince of Abu Dhabi.
December 6: Arab League formally admits the UAE. The first British Ambassador presents his credentials to Sheikh Zayed.
December 9: UAE joins the United Nations.