Vice President Mike Pence doubled down on the United States commitment to Asia Pacific with a stern warning for North Korea, which he called the "most risky and urgent threat" to the region.
North Korea has a long history of portraying mock violence against the United States in propaganda videos.
Lavrov's comments come after President Trump's authorization of a strike on a Syrian airbase two weeks ago caused a flurry of speculation that North Korea might also face military action in response to further provocations.
Pence also told gathered servicemembers from both USA and Japanese forces that Tokyo will "assume a larger role and responsibility" within its security alliance with Washington.
Pence, during an address in Seoul, said this is a "challenging time" for everyone.
Speaking aboard the nuclear-powered USS Ronald Reagan aircraft carrier docked at the U.S. Navy's Yokosuka base, Pence said a diligent and collaborative approach to deescalating tensions on the Korean Peninsula was the way forward.
The DPRK has conducted multiple missile tests and two nuclear tests in the past 18 months, with the United States' recent deployment of an aircraft carrier unit to the region after holding large-scale "war games" near the peninsula also stoking concerns.
However, a display of military might coinciding with the celebration fizzled, as a North Korean missile exploded shortly after being launched.More news: Blue Jackets beat Penguins 5-4 to avoid sweep
"The leader of North Korea again recklessly tried to provoke something by launching a missile", he said.
The North's Foreign Ministry said the missile launches were part of a normal process of building up the country's defences and economy.
"I thought it was important that we went outside", Pence said.
Vice President Mike Pence and Japan's Deputy Prime Minister Taro Aso walk on their way to a meeting at Prime Minister Shinzo Abe's official residence in Tokyo on April 18, 2017.
And she added. "We've seen some tangible indications. that they're working towards this end, but it's still quite early". "We are with you 100 percent".
Abe said Japan likewise hopes for peaceful dialogue with Pyongyang, "but at the same time, dialogue for the sake of dialogue is valueless".
United States Vice President Mike Pence has arrived in Japan for the second leg of his four-nation Asia tour.
Experts point out that China also wants to prevent North Korea from becoming a full-fledged nuclear power - and certainly wants to prevent a war on its southern border that could send millions of refugees flooding into China and potentially risk bringing a U.S. military presence to China's borders. China remains North Korea's chief source of fuel and food imports, but Pyongyang seems to have calculated that Beijing's fears of a collapse of Kim Jong Un's hard-line communist regime override any such snubs.