New Canadian Prime Minister Justin Trudeau touched down Wednesday for his first visit to Britain since his election, with meetings with his British counterpart and Queen Elizabeth II.

Trudeau flew in with his wife Sophie and children in a stopover visit on which he will meet Prime Minister David Cameron before he goes to Malta for a meeting of the Commonwealth heads of government later this week.

Indonesia has increased security at its airports after a threat was directed at an airport serving the capital Jakarta and recent attacks around the world, the transport ministry said Wednesday. 

Sniffer dogs are checking cargo and luggage, random checks are being carried out on cars entering airports, and screening of workers will be tightened under the heightened security measures which came into force Tuesday, the ministry said. 

The government in Moldova said on Wednesday that two of its nationals were among those captured by the Taliban after their helicopter crash-landed in northern Afghanistan and appealed to the United States for help.

"According to information that the Moldovan government has now, there were 21 people on board including three crew members -- two pilots and an engineer, all of them Moldovan nationals," acting prime minister Gheorghe Brega told reporters after an emergency meeting.

U.N. refugee chief Antonio Guterres said Wednesday that people fleeing violence and war must not be shunned amid growing fears of terrorism after the deadly Paris attacks.

"Refugees are victims of terrorists and it's very important to make this distinction," the U.N. High Commissioner for Refugees since 2005 told a press conference in the Japanese capital.

Russian media on Wednesday echoed President Vladimir Putin's tough talk on Turkey's downing of its fighter jet but warned against letting tensions spiral into further conflict.

Front pages were dominated by pictures of the burning Russian jet and Putin's words that its downing was a "stab in the back."

Brussels struggled to return to normal Wednesday after four days on maximum terror alert, with schools and the metro reopening despite two suspects from the Paris attacks still being at large.

Troops and police were still patrolling the streets of the Belgian capital and the alert status remained at the highest possible level of four, leading to questions about what had changed since schools had closed on Monday.

Russia would be prepared to "create a joint staff" to fight the Islamic State in which Moscow would work with France, the United States and even Turkey, the Russian ambassador to France said Wednesday.

"We are prepared to... plan strikes on Daesh (IS) positions together and create a joint staff with France, the U.S., with all the countries who want to be in this coalition," said Alexander Orlov.

Tensions between Moscow and Kiev ratcheted up further Wednesday as Ukraine decided to stop buying gas from Russia and closed its airspace to its giant eastern neighbor’s airlines.

The two measures not only underscore the acrimonious nature of the former Soviet countries' relations but also highlight how difficult one of Europe's deadliest crises since the Balkans Wars of the 1990s may be to resolve.

President Recep Tayyip Erdogan sought to play down tensions with Russia Wednesday after Turkey's downing of a Russian warplane on the Syria border sparked fears among NATO allies of a wider conflict.

Moscow said Russian and Syrian special forces had rescued one of the pilots who ejected from the plane after being shot down early Tuesday but confirmed another was dead, in an incident that threatens to damage relations between two rival players in the Syrian conflict.

The Indian army killed three suspected rebels and another person was shot dead during a six-hour gun battle Wednesday on a military camp in Indian Kashmir near the border with Pakistan, a military spokesman said.

Heavily-armed fighters stormed the army base in Tangdhar, 140 kilometers (87 miles) northwest of the main city of Srinagar, setting off grenades and firing automatic weapons.