Moscow's announcement about new missiles follows its seizure of three Ukrainian naval vessels and their crews on Sunday over what it said was their illegal entry into Russian waters, something Ukraine denies.
Russian President Vladimir Putin expressed "serious concern" over Ukraine's decision to impose martial law.
Lavrov said Ukrainian warships had ignored maritime law when they tried to enter the Kerch Strait, aiming to create a scandal for domestic political purposes and U.S. encouragement for such acts "saddens me greatly".
Several senior European politicians raised the prospect on Tuesday and US President Donald Trump said he might cancel a meeting with Putin later this week over the maritime clash he described as "aggression".
Jose Mourinho criticises Manchester United's heart and desire after Palace stalemate
That peril should be avoided on Tuesday by United having switched pre-match bases to a hotel much closer to the ground. Matteo Darmian , who started against Palace, was also missing from Monday's training, along with Marcos Rojo.
On Sunday near Crimea, Russian border guards rammed into and opened fire on three Ukrainian navy vessels traveling from the Black Sea toward a Ukrainian port. Trump said, however, that he was still awaiting a "full report" from his national security team about the incident.
Ukraine has warned of the threat of a full-scale war with Russian Federation, following what it called Moscow's QUOTE dramatic military buildup at the border.
Putin's foreign affairs adviser, Yuri Ushakov, noted that the meeting, which is set for Saturday, has been prepared through official channels and Moscow expects Washington to notify it of any changes in the same way.
The US previously said Russia's deployment of the missile systems to Crimea was "not good".
Lakhs Throng Ayodhya to Demand Construction of Ram Mandir
Sharma said the delay has disappointed India's majority Hindu community which cannot wait endlessly for a verdict. Hindu groups say the mosque was built after a temple dedicated to Ram was destroyed by Muslim invaders.
The Ukrainian parliament on Monday voted in favour of Poroshenko's request for the introduction of martial law in border areas for 30 days.
The state-run RIA news agency said the new S-400 systems would be operational by the end of the year.
A spokesman for Russia's Southern Military District said that Moscow will add one S-400 surface-to-air missile system to the three already deployed in Crimea.
The comments were his strongest to date in condemnation of Russia's recent actions in Ukraine, where tensions are flaring.
The warning from Larry Kudlow, director of the National Economic Council, came ahead of the two leaders' high-stakes sit-down on Saturday evening.
Sismo de 5.1 sacude Venezuela; no se reportan daños ni víctimas
Alrededor de las 4:40 de la tarde de este sábado, habitantes de Maracaibo y de la región andina reportaron un temblor . Servicio geológico de Colombia confirmó que un sismo de 5,1 sacudió a Venezuela .
"We must use the right terms: this is a war in Europe", she said. "Maybe I won't even have the meeting.I don't like that aggression". Russia is treating the seamen as individuals who violated the Russian border, an offense that carries up to six years in prison. "What they are saying now is not true", he told Ukrainian media.