When North Korean leader Kim Jong Un sent Lunar New Year greetings this year, the first card went to Russian President Vladimir Putin, ahead even of leaders from China and other allies of the isolated country, according to its official news agency.

Some academics who study North Korea say Kim could be looking for Russia to ease the pain if China, which accounts for about 90 percent of North Korea’s trade, steps up sanctions against the isolated country as part of moves to deter its nuclear and missile programs.

U.S. President Donald Trump lavished praise on Chinese President Xi Jinping last week for Beijing’s assistance in trying to rein in Pyongyang. A day later, U.S. Secretary of State Rex Tillerson pressed the United Nations Security Council to impose more sanctions to further isolate Pyongyang.

There is no sign of any sustainable increase in trade between Russia and North Korea, but business and transport links between the two are getting busier.

A new ferry service starting next week will move up to 200 passengers and 1,000 tons of cargo six times a month between North Korea and the Russian port of Vladivostok.

Shipping data show there has been a recent steady flow of oil tanker traffic from Vladivostok to North Korea’s east coast. Last Thursday, five North Korean-flagged oil tankers loaded up at Vladivostok-area ports and identified North Korea as their destination. It was not known what products they were carrying.

Earlier this year, Russian officials visited Pyongyang to discuss more cooperation in rail transport. A Russian-built railway between the eastern Russian border town of Khasan and the North Korean port of Rajin has been used to carry coal, metals and oil products.

“North Korea does not care about China’s pressure or sanctions because there is Russia next door,” said Leonid Petrov, a North Korea expert at Australia National University in Canberra. “Pyongyang has been playing off Beijing and Moscow for half a century, letting them compete for the right to aid and influence North Korea.”

Still, despite the differences with the United States and the existing links with North Korea, experts say Russia is unlikely to sharp increase trade with Pyongyang because of its low foreign exchange reserves and general unreliability.

“All trade with North Korea has to be subsidized,” said Andrei Lankov, a Russian expert on North Korea at Seoul’s Kookmin University. “I do not see the Russian government spending its dwindling currency reserves to support the regime they despise and see as incurably ungrateful, and also prone to risky adventurism.”

Russia — especially Vladivostok — is home to one of the largest overseas communities of North Koreans in the world, and they send home tens of thousands of dollars in much-needed hard currency each month.

Speaking at the United Nations last week, Tillerson called on countries to sever diplomatic and financial ties with Pyongyang and suspend the flow of North Korean guest workers. The Security Council has not yet agreed on any course of action.

While Russia has not indicated it will oppose U.N. sanctions or seek to dilute them, its ties with the United States are fraught, which could complicate its joining any U.S.-led initiative on North Korea.

Trump and Putin spoke in a telephone call on Tuesday and discussed North Korea, among other issues. There was no word of any agreement.

Samuel Ramani, a Russia expert at Oxford University, said support for the Pyongyang regime could bring economic benefits for Moscow. It would demonstrate Russia is “a loyal partner to anti-Western regimes facing international isolation and sanctions,” he said. “As Russia has close economic links with other countries at odds with the West — like Iran, Venezuela and Syria — this symbolic dimension of the Russia-North Korea relationship has strategic significance.”

The United States is calling for an embargo on oil sales to North Korea, which imports all its fuel. China, North Korea’s main supplier, is unlikely to agree to a full embargo, experts say, because that would be potentially destabilizing for the Pyongyang regime, but it may impose curbs on the trade.

China exports about 500,000 tons of crude oil and 270,000 tons of petroleum products each year, oil industry sources in China say. Russia, the other major supplier of oil to North Korea, exported about 36,000 tons of oil products in 2015, the latest year for which figures are available, according to U.N. data.

Russia has already taken over the supply of jet fuel to North Korea after China halted exports two years ago, according to the industry sources in China.

Russia is also the source of foreign exchange for North Korea, mostly from Vladivostok.

The city of 600,000 people, just 100 km (60 miles) from the border with North Korea, is home to thousands of North Koreans, who mainly work on construction or do home renovations. A city website advertises “Korean professional contractors” and says they work “cheaply and fast.”

One North Korean handyman said in an interview that he was obliged to hand over part of his income — $500 — to the North Korean state each month. Thin and in his 30s, he did not disclose his monthly income but said he charges 4,000 rubles ($70) for a day’s labor.

He has worked in Russia for 11 years, leaving his wife and daughter back home and seeing them only on rare visits.

Like all North Koreans, he wore a badge on his lapel bearing a portrait of the national founder, Kim Il Sung.

“It’s better here than in North Korea,” said the man. “It’s a very difficult life there. Here you can make money.”

The most symbolic upturn in ties between Russia and North Korea will come on Monday with the start of regular trips of the Mangyongbong ferry between Vladivostok and Rajin. Vladimir Baranov, head of the Vladivostok-based company Investstroitrest, said his company had chartered the Mangyongbong and would be the general agent for the ferry route.

The aging boat used to ferry tourists between Japan and North Korea, but Tokyo banned its visits in 2006 as part of sanctions against Pyongyang.

An editorial in the Yomiuri Shimbun newspaper described the ferry service to Russia as “a move that puts a damper on international efforts to strengthen the encirclement of North Korea aimed at halting its nuclear and missile development.”

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