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Dublin, Ireland (CNN) -- U.S. Secretary of State Hillary Clinton is meeting Thursday with key players as part of a new U.S. diplomatic push on Syria, amid reports that the government of President Bashar al-Assad may be preparing to use chemical weapons.
Clinton is holding talks with Russian Foreign Minister Sergei Lavrov while in Dublin for an international security conference.
She also will meet with both Lavrov and the U.N. special envoy to Syria, Lakhdar Brahimi, later in the day, a senior State Department official said.
CNN reported Monday that Syrian forces battling rebels in fierce fighting had started combining chemicals that could be used to make deadly sarin gas for weapons. NBC reported Wednesday night that Syria is loading chemical weapons into bombs. CNN has not confirmed the NBC report.
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Syrian Deputy Foreign Minister Faisal Mekdad rejected the suggestion Thursday. "Syria would never use chemical weapons, even if it had them, against its own people," he told Hezbollah's Al-Manar TV.
He also warned that any foreign intervention against Syria would be "catastrophic" for the entire region.
Russia has blocked action against al-Assad at the United Nations, but diplomats say Moscow, which has insisted there should be no "regime change" in Syria, now increasingly doubts that al-Assad can survive in power.
Special representative Brahimi has not yet proposed a specific plan to try to end the fighting, but Clinton and Lavrov did work one out in June in Geneva.
That plan, which ultimately stalled, proposed creation of a transitional government along with al-Assad leaving office. But Russia later balked at any U.N. Security Council measure that would include sanctions or military action. Clinton insisted any U.N. resolution "have teeth."
Russia continues to blame the opposition for the political impasse, arguing that it has been radicalized, includes members of al Qaeda, and refuses to engage in any negotiations until Assad steps down.
The United States, too, has concerns about the increasing radicalization of some armed factions of the opposition and is moving toward declaring Al Nusra Front a terrorist organization.
Such groups present a dilemma for the United States. Al Nusra Front, officials say, has ruthless and effective fighters that are spearheading gains against al-Assad's weakening forces.
But the stronger the radical groups become, the more the United States worries that the fighting -- not political efforts to find a solution -- will decide the outcome in Syria. As a result, Washington has been pushing the opposition to unite. That process is unfolding with the recent creation of the National Coalition for Syrian Revolutionary and Opposition Forces.
Speaking in Brussels, Belgium, on Wednesday Clinton noted: "Now that there is a new opposition formed, we are going to be doing what we can to support that opposition."
Early next week, Clinton will travel to Marrakesh, Morocco, for a meeting of the Friends of the Syrian People, a gathering of countries that support the political transition.
Clinton said she would "explore with like-minded countries what more we can do to try bring this conflict to an end." The Obama administration, while providing, for now, non-lethal assistance, is expected to take the first steps toward officially recognizing the National Coalition at that meeting.
Clinton also reiterated Wednesday the strong U.S. position set out by President Barack Obama on Monday over any possible use by Syria of chemical weapons. She said the international community is sending a clear message to Damascus.
"Our concerns are that an increasingly desperate Assad regime might turn to chemical weapons or might lose control of them to one of the many groups that are now operating within Syria," she said.
"And so, as part of the absolute unity that we all have on this issue, we have sent an unmistakable message that this would cross a red line and those responsible would be held to account."
U.N. Secretary-General Ban Ki-moon said on a visit to Baghdad Thursday that he had expressed his "gravest concerns" to Syria's government over any use of chemical weapons and had written directly to al-Assad.
He warned that anyone responsible for the use of chemical weapons would face serious consequences.
Ban is to meet with the head of the Organisation for the Prohibition of Chemical Weapons in Baghdad to discuss how it can work with the United Nations on the issue.
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NATO foreign ministers agreed this week to a request by Turkey for Patriot missiles to be deployed along its border to bolster its air defenses against potential Syrian threats.
Errant Syrian artillery shells struck the Turkish border town of Akcakale and killed five Turkish civilians in October.
Early Thursday, the German Cabinet agreed to send Patriot missiles and up to 400 soldiers to Turkey to deter the Syrian civil war from spilling into the country.
In addition to Germany, the United States and Netherlands, both of which have Patriot capabilities, have signaled they would be willing to contribute missiles.
"Any deployment will be defensive only. It will in no way support a no-fly zone or any offensive operation," the NATO statement said.
Germany's parliament will vote on the deployment between December 12 and 14, the foreign ministry said.
"The transfer of German Patriot air defense systems, in close cooperation with the Netherlands and the United States, underscores Germany's reliability as an alliance member," it said in a prepared statement.
NATO's decision was made as the fears surfaced that the Assad regime might be preparing to use chemical weapons.
"The Syrian stockpiles of chemical weapons are a matter of great concern," NATO Secretary General Anders Fogh Rasmussen said.
"We know that Syria possesses missiles. We know they have chemical weapons and, of course, they also have to be included in our calculations," he said. "And this is also the reason why it is a matter of urgency to ensure effective defense and protection of our ally Turkey."
CNN Foreign Affairs Correspondent Jill Dougherty reported from Dublin, Diana Magnay reported from Berlin, and Laura Smith-Spark wrote this story in London.