Washington-based 38 North, a North Korea monitoring project, cited images taken on Nov 5 showing activity at North Korea's Sinpo South Shipyard.
It said the Nov 5 images showed two large circular objects that could be sections of a submarine's pressure hull.
The Asean statement said the growing tension between the U.S. and North Korea should be resolved through a "peaceful" approach, thus, appealed that the two nations exercise "self-restraint" and start non-adversarial dialogue.
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Last week the Trump administration requested $4 billion from Congress for the increased use of cyber weapons to jam North Korean control systems and prevent the launch of missiles, for fleets of missile-firing drones and fighter planes to shoot them down moments after liftoff. Building a vehicle that can protect warheads from the heat and stress of a return flight - or re-entry capability - is critical for developing functional intermediate-range and intercontinental ballistic missiles (ICBMs).
US and Japanese naval forces have begun their annual bilateral training exercise, seen as a show of force amid North Korea's nuclear and ballistic missile tests.
Song would likely "assure Kim that if he behaves within a reasonable bound he can expect Beijing to continue providing some assistance and resist broadening the sanctions", Yuan said.
The North Korean leader is said to rarely meet senior foreign visitors.
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Delta II rocket with NOAA's JPSS-1 satellite early Saturday morning after three previous launch attempts had been scrubbed . After two second-stage engine burns and coast phases, the JPSS-1 weather satellite is deployed into orbit.
"We reiterated our support for the denuclearization of the Korean Peninsula in a peaceful manner and called for the exercise of self-restraint and the resumption of dialogue in order to de-escalate tensions and create conditions conducive to peace and stability", it said.
North Korea has conducted dozens of missile tests this year, and its largest and biggest nuclear test was on Sept 3.
In an interview with Reuters, Han Tae Song, North Korea's ambassador to the United Nations in Geneva, brushed off the new sanctions which the Trump administration has said it is preparing, as well as the possibility of North Korea being added to a USA list of states sponsoring terrorism.
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Chelsea brushed past West Brom at the Hawthorns with our most impressive performance of the season so far. Beyond that it always felt like a question of when, not if, an uneasy alliance would come to an end.